Fait mathématique: 7664 is the Entringer number E(8,6).
Culture générale: 7664 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 24th is the day in 1966 that a Canadair CL-44 chartered by the United States military crashes into a small village in South Vietnam, killing 129.