Fatto generale: 585 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 585 is a palindrome in base 2, base 8, and in base 10.
Trivia: 585 is a boring number.
Data storica: August 7th is the day in 1794 that U.S. President George Washington invokes the Militia Law of 1792 to suppress the Whiskey Rebellion in western Pennsylvania.