general_fact: 47577 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47577 is an unremarkable number.
trivia: 47577 is an unremarkable number.
historical_date: April 5th is the day in 1992 that the Siege of Sarajevo begins when Serb paramilitaries murder peace protesters Suada Dilberovic and Olga Sučić on the Vrbanja Bridge.