Fait mathématique: 9700 is the number of inequivalent 4-digit strings, where two strings are equivalent if turning one upside down gives the other.
Culture générale: 9700 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 22nd is the day in 1944 that the Polish Committee of National Liberation publishes its manifesto, starting the period of Communist rule in Poland.