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27 (twenty-seven) is the natural number following 26 and preceding 28.
- In base 10, it is the first composite number not evenly divisible by any of its digits.
- 27 is the only positive integer that is 3 times the sum of its digits.
- In the Collatz conjecture (aka the "3n + 1 conjecture") a starting value of 27 requires 112 steps to reach 1, many more than any lower number.
- The unique simple formally real Jordan algebra, the exceptional Jordan algebra of self-adjoint 3 by 3 matrices of quaternions, is 27-dimensional.
- It is the twenty-eighth (and twenty-ninth) digit in π. (3.141592653589793238462643383279...). If you start counting with 0 it is considered one of few Self-Locating strings in pi.
- 27 contains the decimal digits 2 and 7, and is the result of adding together the integers from 2 to 7 (2+3+4+5+6+7=27)
- The atomic number of cobalt.
- The atomic weight of the only stable isotope of aluminum.
- 27 Geological epochs of Earth - Middle Triassic of the Mesozoic
In religion, philosophy and the occult
- The Greek Strongs number G27 is "Agapetos" which means "Beloved", as found in the New Testament of the Bible.
- 27 - the highest level of knowledge in rupaloke (Buddhism).
- 27 - number of grains in some Buddhist rosary (108 divided by 4).
- In almost all Christian traditions today, the New Testament consists of 27 books
- Pythagoras and Plato say that the number 3 in the cubed (i.e. 27) and number 2 in the cubed (i.e., 8) represent the Cosmos.
- In the Kabbalah there are 27 letters, corresponding to 27 channels of communication with God and 27 combinations of the names of God and - 13 overt and 14 covert.
- Some Masonic lodges have the 27th title.
- 27 - number of United Trinity Church, taken 9 times, symbolizing the fullness of the Absolute.
- Mystical root of 27 is the number 9.
- According to Feng Shui, to raise money, keep in the house 27 identical coins.
- In ancient Incan culture there were 27 roads to El Dorado.
- In Nidaros there were 27 archbishops (between 1153 and 1537)
- 27 signs of the zodiac in Indian astrology
- Summer, or 27 missing kisses
- Chapter 27-I
- 27 Dresses
- 27 fights
- Order number 27
- Number 27 (written by Michael Palin)
- Three of the cube is zero (science-fiction story)
- The Minneapolis-based artist Deuce 7 (a.k.a. Deuce Seven, Twenty Seven, 27).
- The number of outs in a regulation baseball game for each team at all adult levels, including professional play, is 27.
- In auto racing, 27 and 28 were Ferrari Formula one numbers from 1981 to 1995 except in 1990 when reigning WC Alain Prost had the right to use #1 and drove for the team, Nigel Mansell used #2. Popular driver Gilles Villeneuve used the number on his final days in F1 and later was adopted by his son, Formula One World Champion Jacques Villeneuve, in his NASCAR debut. Jean Alesi, another popular Ferrari driver was the last one ever to use the number back in 1995, also winning the last race with it (as of August 2011), the Canadian GP. Ayrton Senna won his second Formula One World Championship using the mystic number 27 in 1990 in a McLaren Honda, as mentioned, the only time Ferrari didn't use the number during that period. Paul Menard also runs the number 27 in NASCAR as of 2011.
- The jersey number 27 has been retired by several North American sports teams in honor of past playing greats:
- In Major League Baseball:
- In the NBA:
- In the NHL:
- The Phoenix Coyotes, for Teppo Numminen.
- The Toronto Maple Leafs have a policy of not retiring numbers unless the player honoured either died or suffered a career-ending incident while a member of the team. Other players whose numbers would otherwise be retired instead have their numbers enshrined by the team as "Honoured Numbers", which remain in circulation for future players. The number 27 is currently honoured for Frank Mahovlich and Darryl Sittler.
- No team in the NFL has retired the number.
- The jersey number 27 has also been retired by the softball program of the University of Arizona for pitching great Jennie Finch.
- The jersey number 27 is currently used by Ray Rice playing for the Baltimore Ravens.
- The modal age of the peak performance year for Major League Baseball position players, according to a commonly accepted theory by sabermetrician Bill James
- In WWE's annual pay-per-view event Royal Rumble, four WWE Superstars had won the 30-man Royal Rumble at #27 more times than any others number, including #1 and #30.
- The number of times the New York Yankees have won the World Series is 27.
In other fields
Twenty-seven is also:
- A-27 - American attack aircraft
- The 27th U.S.A state - Florida
- The total number of letters in the Hebrew alphabet (22 regular letters and 5 final consonants)
- The total number of letters in the Spanish alphabet (5 vowels and 22 consonants)
- The number of Amendments to the United States Constitution (As of May 7, 1992)
- The code for international direct-dial phone calls to South Africa
- The designation (I-27) of a US interstate highway in Texas
- The designation (US 27) of a United States national highway from Fort Wayne, Indiana to Miami, Florida
- The name of a cigarette, Marlboro Blend No. 27
- Alternate name for The Hunt, a book by William Diehl
- The number of the French department Eure
- The number of countries in the European Union (as of August 2011)
- Abbé Faria's prisoner number in the book The Count of Monte Cristo
- The number of species Captain Jean-Luc Picard has made contact with in the series Star Trek: The Next Generation
- One of the anthropomorphic math symbols Lisa Simpson imagines talking to her in The Simpsons episode "Girls Just Want to Have Sums", which, instead of offering the expected pun-based aphorism, rather unhelpfully only says "twenty seven"
- In Stephen King's novel "It", It returns every 27 years to Derry.
- 27 is the number of bones in the human hand.
- 27 is the number of MotoGP worldchampion Casey Stoner.
- ^ V. G. Kac, "Classification of Simple Z-Graded Lie Superalgebras and Simple Jordan Superalgebras" Communications in Algebra 5 13 (1977): 1380
- ^ Steve Jenkins, Bones (2010), ISBN 978-0-545-04651-0