Hecho matemático: 9640 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9640 is an unremarkable number.
Fecha histórica: May 23rd is the day in 1967 that Egypt closes the Straits of Tiran and blockades the port of Eilat at the northern end of the Gulf of Aqaba to Israeli shipping.