General fact: 5274 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 5274 is the sum of its proper divisors that contain the digit 7.
Trivia: 5274 is an unremarkable number.
Historical date: June 9th is the day in 1928 that Charles Kingsford Smith completes the first trans-Pacific flight in a Fokker Trimotor monoplane, the Southern Cross.