general_fact: 16290 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 16290 is a boring number.
trivia: 16290 is an unremarkable number.
historical_date: August 6th is the day in 1284 that the Republic of Pisa is defeated in the Battle of Meloria by the Republic of Genoa, thus losing its naval dominance in the Mediterranean.