21285768

Names of 21285768

• Cardinal: 21285768 can be written as Twenty-one million, two hundred eighty-five thousand, seven hundred sixty-eight.

Scientific notation

• Scientific notation: 2.1285768 × 10⁷

Factors of 21285768

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 315

Divisors of 21285768

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 4 6 7 8 12 14 17 21 24 28 29 34 42 51 56 58 68 84 87 102 116 119 136 168 174 203 204 232 238 257 348 357 406 408 476 493 514 609 696 714 771 812 952 986 1028 1218 1428 1479 1542 1624 1799 1972 2056 2436 2856 2958 3084 3451 3598 3944 4369 4872 5397 5916 6168 6902 7196 7453 8738 10353 10794 11832 13107 13804 14392 14906 17476 20706 21588 22359 26214 27608 29812 30583 34952 41412 43176 44718 52171 52428 59624 61166 82824 89436 91749 104342 104856 122332 126701 156513 178872 183498 208684 244664 253402 313026 366996 380103 417368 506804 626052 733992 760206 886907 1013608 1252104 1520412 1773814 2660721 3040824 3547628 5321442 7095256 10642884 21285768
• Sum of all divisors σ(n): 66873600
• Sum of proper divisors (its aliquot sum) s(n): 45587832
• 21285768 is an abundant number, because the sum of its proper divisors (45587832) is greater than itself. Its abundance is 24302064

Bases of 21285768

• Binary: 1010001001100101110001000₂
• Hexadecimal: 0x144CB88
• Base-36: CO87C

Squares and roots of 21285768

• 21285768 squared (21285768²) is 453083919349824
• 21285768 cubed (21285768³) is 9644239191811064504832
• The square root of 21285768 is 4613.6501817975
• The cube root of 21285768 is 277.1382316057

Scales and comparisons

• 21,285,768 seconds is equal to 35 weeks, 1 day, 8 hours, 42 minutes, 48 seconds.
• To count from 1 to 21,285,768 would take you about five 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 21285768 cubic inches would be around 23.1 feet tall.

Recreational maths with 21285768

• 21285768 backwards is 86758212
• The number of decimal digits it has is: 8
• The sum of 21285768's digits is 39
• More coming soon!