Fait général: 1644 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1644 is an uninteresting number.
Culture générale: 1644 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 1st is the day in 1968 that the Nuclear non-proliferation treaty is signed in Washington, D.C., London and Moscow by sixty-two countries.