Mathematical fact: 5789 is a value of n for which n and 8n together use each digit 1-9 exactly once.
Trivia: 5789 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: November 6th is the day in 1965 that Cuba and the United States formally agree to begin an airlift for Cubans who want to go to the United States.