585

585 = 3 x 3 x 5 x 13.

585 is 1001001001 in base 2 (binary) and 1111 in base 8. It is a palindrome in base 2, base 8, and base 10.

585 is the number of integer partitions of 35 into distinct parts.

585 has two representations as a sum of two squares: 585 = 3² + 24² = 12² + 21².

585 is a divisor of 64² - 1.

Source: What's Special About This Number?