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50 (fifty) is a positive integer following 49 and preceding 51. Its ordinal form is written "fiftieth" or 50th.

Properties Edit

50 is an even composite number.

50 is the number of known Mersenne primes and perfect numbers.

50 is the number of US states.

In googology Edit

In Greek-based number-naming systems, 50 is associated with prefix "pentaconta-", and with prefix "quinquaginti-" in Latin systems.

Currency-related use Edit

Some currencies, such as the euro and the United States dollar, have banknotes with this number in the denomination.

Some currencies, such as the Czech koruna and the Hungarian forint, have coins with this number in the denomination.

50

It is also the prize for correctly answering the first question in the German game show Wer wird Millionär? in euros.

In chess Edit

There is a fifty-move rule preventing endless chess games.