Fait général: 1680 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1680 is the smallest number with 40 divisors.
Culture générale: 1680 is an unremarkable number.
Date historique: August 6th is the day in 1986 that a low-pressure system that redeveloped off the New South Wales coast dumps a record 328 millimeters (13 inches) of rain in a day on Sydney.