Fatto generale: 28577 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28577 is a boring number.
Trivia: 28577 is an uninteresting number.
Data storica: March 28th is the day in 2005 that the 2005 Sumatra earthquake rocks Indonesia, and at magnitude 8.7 is the fourth strongest earthquake since 1965.