Fait général: 1690 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1690 is the number of ordered sequences of coins totaling 27 cents.
Culture générale: 1690 is an unremarkable number.
Date historique: August 16th is the day in 1841 that U.S. President John Tyler vetoes a bill which called for the re-establishment of the Second Bank of the United States.