General fact: 7428 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 7428 is an uninteresting number.
Trivia: 7428 is a boring number.
Historical date: May 2nd is the day in 1885 that Cree and Assiniboine warriors win the Battle of Cut Knife, their largest victory over Canadian forces during the North-West Rebellion.