52 (number)

From HandWiki
Short description: Natural number
← 51 52 53 →
Cardinalfifty-two
Ordinal52nd
(fifty-second)
Factorization22 × 13
Divisors1, 2, 4, 13, 26, 52
Greek numeralΝΒ´
Roman numeralLII
Binary1101002
Ternary12213
Quaternary3104
Quinary2025
Senary1246
Octal648
Duodecimal4412
Hexadecimal3416
Vigesimal2C20
Base 361G36

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

In mathematics

Fifty-two is

  • a composite number; a square-prime, of the form (p2, q) where q is a higher prime. It is the sixth of this form and the fifth of the form (22.q).
  • the 5th Bell number,[1] the number of ways to partition a set of 5 objects.
  • a decagonal number.[2]
  • with an aliquot sum of 46; within an aliquot sequence of seven composite numbers (52,46,26,16,15, 9,4,3,1,0) to the prime in the 3-aliquot tree. This sequence does not extend above 52 because it is,
  • an untouchable number, since it is never the sum of proper divisors of any number,[3] and it is a noncototient since it is not equal to x − φ(x) for any x.[4]
  • a vertically symmetrical number.[5]

In science

Astronomy

In other fields

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 etc.

See also

  • B52 (disambiguation)
  • List of highways numbered 52

References