Fatto matematico: 6714 is the index of a triangular number containing only 3 different digits.
Trivia: 6714 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 19th is the day in 1950 that a barge containing munitions destined for Pakistan explodes in the harbor at South Amboy, New Jersey, devastating the city.