Fatto generale: 8463 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8463 is the smaller number in a Ruth-Aaron pair.
Trivia: 8463 is an uninteresting number.
Data storica: March 3rd is the day in 2005 that Steve Fossett becomes the first person to fly an airplane non-stop around the world solo without refueling.