Fatto generale: 9767 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9767 is the largest 4 digit prime composed of concatenating two 2 digit primes.
Trivia: 9767 is a boring number.
Data storica: September 27th is the day in 1066 that William the Conqueror and his army set sail from the mouth of the Somme River, beginning the Norman Conquest of England.