Fatto matematico: 9643 is the smallest number that can not be formed using the numbers 2^{0}, 2^{1}, ... , 2^{7}, together with the symbols +, –, × and ÷.
Trivia: 9643 is a boring number.
Data storica: May 26th is the day in 1991 that Zviad Gamsakhurdia becomes the first elected President of the Republic of Georgia in the post-Soviet era.