general_fact: 7883 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 7883 is an unremarkable number.
trivia: 7883 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: July 31st is the day in 1938 that Bulgaria signs a non-aggression pact with Greece and other states of Balkan Antanti (Turkey, Romania, Yugoslavia).