General fact: 787 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 787 is a palindrome in base 3 and in base 10.
Trivia: 787 is an uninteresting number.
Historical date: February 25th is the day in 1797 that Colonel William Tate and his force of 1000-1500 soldiers surrender after the Last Invasion of Britain.