Fatto matematico: 8670 is a value of n for which n!!.
Trivia: 8670 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 26th is the day in 2009 that Typhoon Ketsana (2009) hit the Philippines, China, Vietnam, Cambodia, Laos and Thailand, causing 700 fatalities.