Fatto matematico: 4652 is the number of labeled connected graphs with 6 vertices that have chromatic number 4.
Trivia: 4652 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 25th is the day in 1555 that the Peace of Augsburg is signed in Augsburg by Charles V and the princes of the Schmalkaldic League.