General fact: 828 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 828 is an uninteresting number.
Trivia: 828 is an unremarkable number.
Historical date: April 7th is the day in 1927 that First distance public television broadcast (from Washington, D.C., to New York City, displaying the image of Commerce Secretary Herbert Hoover).