Fait général: 2637 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2637 is the number of commutative monoids of order 7.
Culture générale: 2637 is a boring number.
Date historique: March 21st is the day in 1935 that Shah Reza Pahlavi formally asks the international community to call Persia by its native name, Iran, which means 'Land of the Aryans.