Fatto generale: 6740 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6740 is the number of 13-iamonds that do not tile the plane.
Trivia: 6740 is an uninteresting number.
Data storica: June 14th is the day in 1959 that Disneyland Monorail System, the first daily operating monorail system in the Western Hemisphere, opens to the public in Anaheim, California.