Fait mathématique: 6741 is a value of n for which n and 8n together use each digit 1-9 exactly once.
Culture générale: 6741 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: June 15th is the day in 1804 that New Hampshire approves the Twelfth Amendment to the United States Constitution, ratifying the document.