general_fact: 5729 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5729 is an unremarkable number.
trivia: 5729 is an unremarkable number.
historical_date: September 7th is the day in 1999 that a 5.9 magnitude earthquake rocks Athens, rupturing a previously unknown fault, killing 143, injuring more than 500, and leaving 50,000 people homeless.