Fatto matematico: 964 is the number of 3×3 sliding puzzle positions that require exactly 12 moves to solve starting with the hole in the center.
Trivia: 964 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: August 21st is the day in 2001 that the Red Cross announces that a famine is striking Tajikistan, and calls for international financial aid for Tajikistan and Uzbekistan.