Fatto generale: 634 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 634 is a number n whose 5^{th} root has a decimal part that begins with the digits of n.
Trivia: 634 is an unremarkable number.
Data storica: September 25th is the day in 2010 that Mahmoud Abbas speaks at United Nations General Assembly to request that Israel end its policy of building settlements in the West Bank.