Fifty-two

Fifty-two (52, LII) is the natural number following fifty-one and preceeding fifty-three. Its divisors are 1, 2, 4, 13, 26 and 52; its factorisation is

• 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 deck of poker playing cards, not counting Jokers and advertisement cards.
• The code for international direct dial phone calls to Mexico.