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 1965 that Nguyen Cao Ky became Prime Minister of South Vietnam at the head of a military junta; General Nguyen Van Thieu became the figurehead chief of state.