Fatto generale: 548 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 548 is the maximum number of 9^{th} powers needed to sum to any number.
Trivia: 548 is an unremarkable number.
Data storica: July 1st is the day in 1987 that the American radio station WFAN in New York, New York is launched as the world's first all-sports radio station.