52 (number)

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← 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[edit]

Fifty-two is the 6th Bell number[1] and a decagonal number.[2] 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 never the answer to the equation x − φ(x).[4]

In science[edit]

Astronomy[edit]

In other fields[edit]

The piano has 52 white keys

Fifty-two is:

Historical years[edit]

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

See also[edit]

B52 (disambiguation)

References[edit]

  1. ^ "Sloane's A000110 : Bell or exponential numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  2. ^ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ^ "Sloane's A005114 : Untouchable numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  4. ^ "Sloane's A005278 : Noncototients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.