Fait général: 6427 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6427 is the number of ways a 6×6 square can be tiled with 1×1 and 2×2 squares.
Culture générale: 6427 is an unremarkable number.
Date historique: August 5th is the day in 1981 that Ronald Reagan fires 11,359 striking air-traffic controllers who ignored his order for them to return to work.