general_fact: 83573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 83573 is an uninteresting number.
trivia: 83573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: October 24th is the day in 1590 that John White, The governor of the second Roanoke Colony, returns to England after an unsuccessful search for the "lost" colonists.