General fact: 28530 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 28530 is an unremarkable number.
Trivia: 28530 is an unremarkable number.
Historical date: February 9th is the day in 1895 that William G. Morgan creates a game called Mintonette, which soon comes to be referred to as volleyball.