81438768138
81,438,768,138 is an even composite number composed of six prime numbers multiplied together.
81438768138 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two hundred forty divisors.
Prime factorization of 81438768138:
2 × 3 × 7 × 132 × 234 × 41
(2 × 3 × 7 × 13 × 13 × 23 × 23 × 23 × 23 × 41)See below for interesting mathematical facts about the number 81438768138 from the Numbermatics database.
Names of 81438768138
- Cardinal: 81438768138 can be written as Eighty-one billion, four hundred thirty-eight million, seven hundred sixty-eight thousand, one hundred thirty-eight.
Scientific notation
- Scientific notation: 8.1438768138 × 1010
Factors of 81438768138
Divisors of 81438768138
- Number of divisors d(n): 240
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Complete list of divisors:
1 2 3 6 7 13 14 21 23 26 39 41 42 46 69 78 82 91 123 138 161 169 182 246 273 287 299 322 338 483 507 529 533 546 574 598 861 897 943 966 1014 1058 1066 1183 1587 1599 1722 1794 1886 2093 2366 2829 3174 3198 3549 3703 3731 3887 4186 5658 6279 6601 6877 6929 7098 7406 7462 7774 11109 11193 11661 12167 12259 12558 13202 13754 13858 19803 20631 20787 21689 22218 22386 23322 24334 24518 27209 36501 36777 39606 41262 41574 43378 48139 48503 54418 65067 73002 73554 81627 85169 85813 89401 96278 97006 130134 144417 145509 151823 158171 159367 163254 170338 171626 178802 255507 257439 268203 279841 281957 288834 291018 303646 316342 318734 455469 474513 478101 498847 511014 514878 536406 559682 563914 625807 839523 845871 910938 949026 956202 997694 1107197 1115569 1251614 1496541 1679046 1691742 1877421 1958887 1973699 2056223 2214394 2231138 2993082 3321591 3346707 3491929 3637933 3665441 3754842 3917774 3947398 4112446 5876661 5921097 6168669 6485011 6643182 6693414 6983858 7275866 7330882 10475787 10913799 10996323 11473481 11753322 11842194 12337338 12970022 14393561 19455033 20951574 21827598 21992646 22946962 25465531 25658087 28787122 34420443 38910066 43180683 45395077 47293129 50931062 51316174 68840886 76396593 76974261 80314367 84305143 86361366 90790154 94586258 136185231 141879387 149155253 152793186 153948522 160628734 168610286 240943101 252915429 272370462 283758774 298310506 331051903 447465759 481886202 505830858 590136001 662103806 894931518 993155709 1044086771 1180272002 1770408003 1939018289 1986311418 2088173542 3132260313 3540816006 3878036578 5817054867 6264520626 11634109734 13573128023 27146256046 40719384069 81438768138
- Sum of all divisors σ(n): 215867889216
- Sum of proper divisors (its aliquot sum) s(n): 134429121078
- 81438768138 is an abundant number, because the sum of its proper divisors (134429121078) is greater than itself. Its abundance is 52990352940
Bases of 81438768138
- Binary: 10010111101100010000011111100000010102
- Hexadecimal: 0x12F620FC0A
- Base-36: 11EUJFNU
Squares and roots of 81438768138
- 81438768138 squared (814387681382) is 6632272955834923987044
- 81438768138 cubed (814387681383) is 540124139478168288783730832004072
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The
square root of 81438768138 is 285374.7853928233 -
The
cube root of 81438768138 is 4334.5471548503
Scales and comparisons
How big is 81438768138?- 81,438,768,138 seconds is equal to 2,589 years, 26 weeks, 8 hours, 2 minutes, 18 seconds.
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To count from 1 to 81,438,768,138 would take you about five thousand, one hundred seventy-nine years!
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 81438768138 cubic inches would be around 361.2 feet tall.
Recreational maths with 81438768138
- 81438768138 backwards is 83186783418
- The number of decimal digits it has is: 11
- The sum of 81438768138's digits is 57
- More coming soon!
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