general_fact: 55928 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 55928 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 55928 is an unremarkable number.
historical_date: February 14th is the day in 842 that Charles the Bald and Louis the German swear the Oaths of Strasbourg in the French and German languages.