Adding up the divisors of 1 through 9 gives 69.
Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "odious number." Of note is that 69² (4 761) and 69³ (328 509) together use every decimal digit from 0-9. 69 is equal to 105 octal, while 105 is equal to 69 hexadecimal. This same property can be applied to all numbers from 64 to 69.
In other fields
Sixty-nine may also refer to:
- The registry of the U.S. Navy's aircraft carrier USS Dwight D. Eisenhower (CVN-69), named after Dwight D. Eisenhower, the 34th President of the United States and five-star general in the United States Army
- The number of the French department Rhône
- The Taijitu
- The number Bill and Ted were thinking of when talking to their future selves, see Bill and Ted's Excellent Adventure
- The sexual position