Hecho general: 6357 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 6357 is an unremarkable number.
Trivia: 6357 is a boring number.
Fecha histórica: May 27th is the day in 1971 that the Dahlerau train disaster, the worst railway accident in West Germany, kills 46 people and injures 25 near Wuppertal.