689

Names of 689

• Cardinal: 689 can be written as Six hundred eighty-nine.

Scientific notation

• Scientific notation: 6.89 × 10²

Factors of 689

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 66

Divisors of 689

• Number of divisors d(n): 4
• Complete list of divisors:
  1 13 53 689
• Sum of all divisors σ(n): 756
• Sum of proper divisors (its aliquot sum) s(n): 67
• 689 is a deficient number, because the sum of its proper divisors (67) is less than itself. Its deficiency is 622

Bases of 689

• Binary: 1010110001₂
• Hexadecimal: 0x2B1
• Base-36: J5

Squares and roots of 689

• 689 squared (689²) is 474721
• 689 cubed (689³) is 327082769
• The square root of 689 is 26.2488094969
• The cube root of 689 is 8.8322849909

Scales and comparisons

• 689 seconds is equal to 11 minutes, 29 seconds.
• To count from 1 to 689 would take you about five minutes.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 689 cubic inches would be around 0.7 feet tall.

Recreational maths with 689

• 689 backwards is 986
• The number of decimal digits it has is: 3
• The sum of 689's digits is 23
• More coming soon!