fiftytwo

Fifty-two is the natural number that comes after fifty-one and before fifty-three. It is an even composite number. Its prime factorization is 2^2 × 13, and its positive divisors are 1, 2, 4, 13, 26, and 52.

In the Gregorian calendar, a common year has 365 days, which is 52 weeks plus one day; a leap year has 366 days, or 52 weeks plus two days.

In playing cards, a standard deck contains 52 cards, composed of four suits of thirteen ranks. Jokers are not included in the standard 52-card set used for most games.

In music, a standard piano keyboard has 52 white keys, and 36 black keys, for a total of 88 keys. The arrangement spans multiple octaves and underpins the layout of Western tonal music.

In chemistry, 52 is the atomic number of tellurium (Te), a brittle metalloid found in the Earth's crust and used in certain alloys and semiconductor applications.