general_fact: 7765 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 7765 is the number of ways to tile a 7×5 rectangle with integer-sided squares.
trivia: 7765 is an unremarkable number.
historical_date: April 4th is the day in 1850 that the Great Fire of Cottenham, a large part of the Cambridgeshire village (England) is burnt to the ground under suspicious circumstances.