Hecho matemático: 224 is a tetrahedral number, the sum of the first ten triangular numbers.
Trivia: 224 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: August 11th is the day in 1920 that the Latvian–Soviet Peace Treaty, which relinquished Russia's authority and pretenses to Latvia, is signed, ending the Latvian War of Independence.