52 (number)

← 51 52 53 →
← 50 51 52 53 54 55 56 57 58 59 → List of numbers Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	fifty-two
Ordinal	52nd (fifty-second)
Factorization	22 × 13
Divisors	1, 2, 4, 13, 26, 52
Greek numeral	ΝΒ´
Roman numeral	LII
Binary	1101002
Ternary	12213
Senary	1246
Octal	648
Duodecimal	4412
Hexadecimal	3416

52 (fifty-two) is the natural number following 51 and preceding 53.

In mathematics

Fifty-two is the 6th Bell number and a decagonal number. It is an untouchable number, since it is never the sum of proper divisors of any number, and it is a noncototient since it is never the answer to the equation x − φ(x).

In science

• The atomic number of tellurium

Astronomy

• Messier object M52, a magnitude 8.0 open cluster in the constellation Cassiopeia, also known as NGC 7654.
• The New General Catalogue object NGC 52, a spiral galaxy in the constellation Pegasus.

In other fields

• U.S. Route 52 that runs from South Carolina to North Dakota

The piano has 52 white keys

Fifty-two is:

• The approximate number of weeks in a year. 52 weeks is 364 days, while the tropical year is 365.24 days long. According to ISO 8601, most years have 52 weeks while some have 53.
• A significant number in the Maya calendar
• On the modern piano, the number of white keys (notes in the C major scale)
• The number of cards in a standard deck of playing cards, not counting Jokers or advertisement cards
• The name of a practical joke card game 52 Pickup
• "52 Pick-Up" is a film starring Roy Scheider and Ann Margaret
• The code for international direct dial phone calls to Mexico
• A weekly comic series from DC Comics entitled 52 has 52 issues, with a plot spanning one full year.
• The New 52 is a 2011 revamp and relaunch by DC Comics of its entire line of ongoing monthly superhero books.
• The number of letters in the English alphabet, if majuscules are distinguished from minuscules
• The number of the French department Haute-Marne
• 52nd Street (disambiguation)
• 52 Hand Blocks, a variant of the martial art jailhouse rock.
• 52 is the car number of retired NASCAR driver Jimmy Means
• 52 American hostages were held in the Iran hostage crisis
• The number of the laps of the British Grand Prix since 2010.

Historical years

52 BC, AD 52, 1052, 1952, 2052, etc.

See also

B52 (disambiguation)