21728764

Names of 21728764

• Cardinal: 21728764 can be written as Twenty-one million, seven hundred twenty-eight thousand, seven hundred sixty-four.

Scientific notation

• Scientific notation: 2.1728764 × 10⁷

Factors of 21728764

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 5432193

Divisors of 21728764

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 5432191 10864382 21728764
• Sum of all divisors σ(n): 38025344
• Sum of proper divisors (its aliquot sum) s(n): 16296580
• 21728764 is a deficient number, because the sum of its proper divisors (16296580) is less than itself. Its deficiency is 5432184

Bases of 21728764

• Binary: 1010010111000110111111100₂
• Hexadecimal: 0x14B8DFC
• Base-36: CXQ0S

Squares and roots of 21728764

• 21728764 squared (21728764²) is 472139184967696
• 21728764 cubed (21728764³) is 10259000925315414007744
• The square root of 21728764 is 4661.4122323605
• The cube root of 21728764 is 279.0476317149

Scales and comparisons

• 21,728,764 seconds is equal to 35 weeks, 6 days, 11 hours, 46 minutes, 4 seconds.
• To count from 1 to 21,728,764 would take you about six days!

  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 21728764 cubic inches would be around 23.3 feet tall.

Recreational maths with 21728764

• 21728764 backwards is 46782712
• The number of decimal digits it has is: 8
• The sum of 21728764's digits is 37
• More coming soon!