52 (number)

52 is the natural number following 51 and preceding 53.

List of numbers — Integers << 50 51 52 53 54 55 56 57 58 59 >>
Cardinal	fifty-two
Ordinal	52nd (fifty-second)
Factorization	<math>2^2 \cdot 13<math>
Divisors	2, 4, 13, 26
Roman numeral	LII
Binary	110100
Hexadecimal	34

Fifty-two is the 5th 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).

It is also:

• The atomic number of tellurium.
• The number of weeks in a year.
• On the 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 code for international direct dial phone calls to Mexico.
• The number of sons of Nebo in the Census of men of Israel upon return from exile (Holy Bible, Ezra 2:29).
• The year AD 52, 52 BC, and 1952.