Fatto generale: 28280 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28280 is an uninteresting number.
Trivia: 28280 is an uninteresting number.
Data storica: June 4th is the day in 1896 that Henry Ford completes the Ford Quadricycle, his first gasoline-powered automobile, and gives it a successful test run.