675

675 = 3³ x 5².

675 is the smallest order for which there are 17 groups.

675² = 455,625 = (45 + 5 + 625)².

675 is 300 in base 15. It is 10200 in base 5 and 120 in base 25.

Triumph manufactures the Daytona 675 sports motorcycle.

Source: What's Special About This Number?