Hecho general: 7428 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 7428 is a boring number.
Trivia: 7428 is a boring number.
Fecha histórica: May 2nd is the day in 1989 that Hungary begins dismantling its border fence with Austria, which allows a number of East Germans to defect.