Fatto generale: 50857 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 50857 is an unremarkable number.
Trivia: 50857 is an unremarkable number.
Data storica: March 29th is the day in 1942 that the Bombing of Lübeck in World War II is the first major success for the RAF Bomber Command against Germany and a German city.