general_fact: 28750 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 28750 is an unremarkable number.
trivia: 28750 is a boring number.
historical_date: September 17th is the day in 1462 that the Battle of Świecino (also known as the Battle of Żarnowiec) is fought during Thirteen Years' War.