general_fact: 17880 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 17880 is an uninteresting number.
trivia: 17880 is an uninteresting number.
historical_date: December 13th is the day in 1979 that the Canadian Government of Prime Minister Joe Clark is defeated in the House of Commons, prompting the 1980 Canadian election.