general_fact: 87404 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 87404 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 87404 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: April 21st is the day in 1894 that Norway formally adopts the Krag-Jørgensen rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.