81621313740
81,621,313,740 is an even composite number composed of five prime numbers multiplied together.
81621313740 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of two hundred sixteen divisors.
Prime factorization of 81621313740:
22 × 35 × 5 × 29 × 7612
(2 × 2 × 3 × 3 × 3 × 3 × 3 × 5 × 29 × 761 × 761)See below for interesting mathematical facts about the number 81621313740 from the Numbermatics database.
Names of 81621313740
- Cardinal: 81621313740 can be written as Eighty-one billion, six hundred twenty-one million, three hundred thirteen thousand, seven hundred forty.
Scientific notation
- Scientific notation: 8.162131374 × 1010
Factors of 81621313740
Divisors of 81621313740
- Number of divisors d(n): 216
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Complete list of divisors:
1 2 3 4 5 6 9 10 12 15 18 20 27 29 30 36 45 54 58 60 81 87 90 108 116 135 145 162 174 180 243 261 270 290 324 348 405 435 486 522 540 580 761 783 810 870 972 1044 1215 1305 1522 1566 1620 1740 2283 2349 2430 2610 3044 3132 3805 3915 4566 4698 4860 5220 6849 7047 7610 7830 9132 9396 11415 11745 13698 14094 15220 15660 20547 22069 22830 23490 27396 28188 34245 35235 41094 44138 45660 46980 61641 66207 68490 70470 82188 88276 102735 110345 123282 132414 136980 140940 184923 198621 205470 220690 246564 264828 308205 331035 369846 397242 410940 441380 579121 595863 616410 662070 739692 794484 924615 993105 1158242 1191726 1232820 1324140 1737363 1787589 1849230 1986210 2316484 2383452 2895605 2979315 3474726 3575178 3698460 3972420 5212089 5362767 5791210 5958630 6949452 7150356 8686815 8937945 10424178 10725534 11582420 11917260 15636267 16794509 17373630 17875890 20848356 21451068 26060445 26813835 31272534 33589018 34747260 35751780 46908801 50383527 52120890 53627670 62545068 67178036 78181335 83972545 93817602 100767054 104241780 107255340 140726403 151150581 156362670 167945090 187635204 201534108 234544005 251917635 281452806 302301162 312725340 335890180 453451743 469088010 503835270 562905612 604602324 703632015 755752905 906903486 938176020 1007670540 1360355229 1407264030 1511505810 1813806972 2267258715 2720710458 2814528060 3023011620 4081065687 4534517430 5441420916 6801776145 8162131374 9069034860 13603552290 16324262748 20405328435 27207104580 40810656870 81621313740
- Sum of all divisors σ(n): 265957539120
- Sum of proper divisors (its aliquot sum) s(n): 184336225380
- 81621313740 is an abundant number, because the sum of its proper divisors (184336225380) is greater than itself. Its abundance is 102714911640
Bases of 81621313740
- Binary: 10011000000010000001001101000110011002
- Hexadecimal: 0x13010268CC
- Base-36: 11HV80R0
Squares and roots of 81621313740
- 81621313740 squared (816213137402) is 6662038856643512787600
- 81621313740 cubed (816213137403) is 543764363666171040572401581624000
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The
square root of 81621313740 is 285694.4412129855 -
The
cube root of 81621313740 is 4337.7833778989
Scales and comparisons
How big is 81621313740?- 81,621,313,740 seconds is equal to 2,595 years, 15 weeks, 6 days, 3 hours, 9 minutes.
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To count from 1 to 81,621,313,740 would take you about five thousand, one hundred ninety 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 81621313740 cubic inches would be around 361.5 feet tall.
Recreational maths with 81621313740
- 81621313740 backwards is 04731312618
- 81621313740 is a
Harshad number . - The number of decimal digits it has is: 11
- The sum of 81621313740's digits is 36
- More coming soon!
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