Fatto matematico: 6791 is a value of n for which n and 8n together use each digit 1-9 exactly once.
Trivia: 6791 is an uninteresting number.
Data storica: August 4th is the day in 1974 that a bomb explodes in the Italicus Express train at San Benedetto Val di Sambro, Italy, killing 12 people and wounding 22.