Fatto generale: 24378 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 24378 is an uninteresting number.
Trivia: 24378 is an uninteresting number.
Data storica: September 28th is the day in 1928 that Sir Alexander Fleming notices a bacteria-killing mold growing in his laboratory, discovering what later became known as penicillin.