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 uninteresting number.
Trivia: 50857 is an uninteresting number.
Data storica: March 29th is the day in 1867 that Queen Victoria gives Royal Assent to the British North America Act which establishes the Dominion of Canada on July 1.