general_fact: 873 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 873 is an uninteresting number.
trivia: 873 is an unremarkable number.
historical_date: May 22nd is the day in 1964 that U.S. President Lyndon B. Johnson announces the goals of his Great Society social reforms to bring an "end to poverty and racial injustice" in America.