Fatto generale: 4642 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4642 is the smallest number whose cube has 11 digits.
Trivia: 4642 is an uninteresting number.
Data storica: September 15th is the day in 1789 that the United States Department of State is established (formerly known as the "Department of Foreign Affairs").