Fatto generale: 746 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 746 is 1^{7} + 2^{4} + 3^{6}.
Trivia: 746 is a boring number.
Data storica: January 15th is the day in 69 that Otho seizes power in Rome, proclaiming himself Emperor of Rome, but rules for only three months before committing suicide.