27 (number)

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26 27 28
Cardinal twenty-seven
Ordinal 27th
(twenty-seventh)
Factorization 33
Divisors 1, 3, 9, 27
Roman numeral XXVII
Binary 110112
Ternary 10003
Quaternary 1234
Quinary 1025
Senary 436
Octal 338
Duodecimal 2312
Hexadecimal 1B16
Vigesimal 1720
Base 36 R36

27 (twenty-seven) is the natural number following 26 and preceding 28.

In mathematics[edit]

  • 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.[1]
  • 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)

In science[edit]

Astronomy[edit]

Electronics[edit]

In astrology[edit]

  • 27 signs of the zodiac in Indian astrology

In art[edit]

Movies[edit]

  • Summer, or 27 missing kisses
  • Chapter 27-I
  • 27 Dresses
  • 27 fights
  • Order number 27
  • Number 27 (written by Michael Palin)

Music[edit]

References[edit]

  • Three of the cube is zero (science-fiction story)

Other[edit]

  • The Minneapolis-based artist Deuce 7 (a.k.a. Deuce Seven, Twenty Seven, 27).

In sports[edit]

In other fields[edit]

Twenty-seven is also:

  • The 27 Club is a term used to refer to popular musicians who have died at the age of 27
  • A-27 - American attack aircraft
  • 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 code for international direct-dial phone calls to South Africa
  • 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
  • Abbé Faria's prisoner number in the book The Count of Monte Cristo
  • 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.[2]

See also[edit]

References[edit]

  1. ^ V. G. Kac, "Classification of Simple Z-Graded Lie Superalgebras and Simple Jordan Superalgebras" Communications in Algebra 5 13 (1977): 1380
  2. ^ Steve Jenkins, Bones (2010), ISBN 978-0-545-04651-0