Hecho general: 28750 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 28750 is an uninteresting number.
Trivia: 28750 is an uninteresting number.
Fecha histórica: September 17th is the day in 456 that Remistus, Roman general (magister militum), is besieged with a Gothic force at Ravenna and later executed in the Palace in Classis, outside the city.