General fact: 80428 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 80428 is an unremarkable number.
Trivia: 80428 is an unremarkable number.
Historical date: March 15th is the day in 1514 that Jodocus Badius Ascensius publishes Christiern Pedersen's Latin version of Saxo’s Gesta Danorum, the oldest known version of that work.