Fatto matematico: 6479 is a value of n for which n and 8n together use each digit 1-9 exactly once.
Trivia: 6479 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 26th is the day in 1908 that Ed Reulbach becomes the first and only pitcher to throw two shutouts in one day against the Brooklyn Dodgers.