81821315840
81,821,315,840 is an even composite number composed of six prime numbers multiplied together.
81821315840 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two hundred eighty-eight divisors.
Prime factorization of 81821315840:
28 × 5 × 11 × 97 × 139 × 431
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 11 × 97 × 139 × 431)See below for interesting mathematical facts about the number 81821315840 from the Numbermatics database.
Names of 81821315840
- Cardinal: 81821315840 can be written as Eighty-one billion, eight hundred twenty-one million, three hundred fifteen thousand, eight hundred forty.
Scientific notation
- Scientific notation: 8.182131584 × 1010
Factors of 81821315840
Divisors of 81821315840
- Number of divisors d(n): 288
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Complete list of divisors:
1 2 4 5 8 10 11 16 20 22 32 40 44 55 64 80 88 97 110 128 139 160 176 194 220 256 278 320 352 388 431 440 485 556 640 695 704 776 862 880 970 1067 1112 1280 1390 1408 1529 1552 1724 1760 1940 2134 2155 2224 2780 2816 3058 3104 3448 3520 3880 4268 4310 4448 4741 5335 5560 6116 6208 6896 7040 7645 7760 8536 8620 8896 9482 10670 11120 12232 12416 13483 13792 14080 15290 15520 17072 17240 17792 18964 21340 22240 23705 24464 24832 26966 27584 30580 31040 34144 34480 35584 37928 41807 42680 44480 47410 48928 53932 55168 59909 61160 62080 67415 68288 68960 75856 83614 85360 88960 94820 97856 107864 110336 119818 122320 124160 134830 136576 137920 148313 151712 167228 170720 177920 189640 195712 209035 215728 239636 244640 269660 273152 275840 296626 299545 303424 334456 341440 379280 391424 418070 431456 459877 479272 489280 539320 551680 593252 599090 606848 658999 668912 682880 741565 758560 836140 862912 919754 958544 978560 1078640 1186504 1198180 1213696 1317998 1337824 1365760 1483130 1517120 1672280 1725824 1839508 1917088 1957120 2157280 2299385 2373008 2396360 2635996 2675648 2966260 3034240 3294995 3344560 3451648 3679016 3834176 4314560 4598770 4746016 4792720 5271992 5351296 5811173 5932520 6068480 6589990 6689120 7358032 7668352 8629120 9197540 9492032 9585440 10543984 10702592 11622346 11865040 13179980 13378240 14716064 15336704 17258240 18395080 18984064 19170880 21087968 23244692 23730080 26359960 26756480 29055865 29432128 36790160 37968128 38341760 42175936 46489384 47460160 52719920 53512960 58111730 58864256 63922903 73580320 76683520 84351872 92978768 94920320 105439840 116223460 117728512 127845806 147160640 168703744 185957536 189840640 210879680 232446920 255691612 294321280 319614515 371915072 421759360 464893840 511383224 588642560 639229030 743830144 843518720 929787680 1022766448 1278458060 1487660288 1859575360 2045532896 2556916120 3719150720 4091065792 5113832240 7438301440 8182131584 10227664480 16364263168 20455328960 40910657920 81821315840
- Sum of all divisors σ(n): 218067655680
- Sum of proper divisors (its aliquot sum) s(n): 136246339840
- 81821315840 is an abundant number, because the sum of its proper divisors (136246339840) is greater than itself. Its abundance is 54425024000
Bases of 81821315840
- Binary: 10011000011001110111000110011000000002
- Hexadecimal: 0x130CEE3300
- Base-36: 11L6ARCW
Squares and roots of 81821315840
- 81821315840 squared (818213158402) is 6694727725789034905600
- 81821315840 cubed (818213158403) is 547771431714589538219882184704000
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The
square root of 81821315840 is 286044.2550375729 -
The
cube root of 81821315840 is 4341.3235403487
Scales and comparisons
How big is 81821315840?- 81,821,315,840 seconds is equal to 2,601 years, 34 weeks, 3 days, 23 hours, 17 minutes, 20 seconds.
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To count from 1 to 81,821,315,840 would take you about five thousand, two hundred three 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 81821315840 cubic inches would be around 361.8 feet tall.
Recreational maths with 81821315840
- 81821315840 backwards is 04851312818
- The number of decimal digits it has is: 11
- The sum of 81821315840's digits is 41
- More coming soon!
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