Fatto matematico: 7692 is a value of n for which n and 2n together use each digit 1-9 exactly once.
Trivia: 7692 is an uninteresting number.
Data storica: January 21st is the day in 1958 that the last Fokker C.X in military service, the Finnish Air Force FK-111 target tower, crashes, killing the pilot and winch-operator.