Hecho general: 8224 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 8224 is an unremarkable number.
Trivia: 8224 is an uninteresting number.
Fecha histórica: July 7th is the day in 2005 that a series of four explosions occurs on London's transport system killing 56 people including four alleged suicide bombers and injuring over 700 others.