81804721920

Names of 81804721920

• Cardinal: 81804721920 can be written as Eighty-one billion, eight hundred four million, seven hundred twenty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 8.180472192 × 10¹⁰

Factors of 81804721920

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 122

Divisors of 81804721920

• Number of divisors d(n): 864
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 19 20 23 24 29 30 32 38 40 41 46 48 57 58 60 64 69 76 80 82 87 92 95 96 114 115 116 120 123 128 138 145 152 160 164 174 184 190 192 205 228 230 232 240 246 256 276 285 290 304 320 328 345 348 368 380 384 410 435 437 456 460 464 480 492 551 552 570 580 608 615 640 656 667 690 696 736 760 768 779 820 870 874 912 920 928 943 960 984 1102 1104 1140 1160 1189 1216 1230 1280 1311 1312 1334 1380 1392 1472 1520 1558 1640 1653 1681 1740 1748 1824 1840 1856 1886 1920 1968 2001 2185 2204 2208 2280 2320 2337 2378 2432 2460 2622 2624 2668 2755 2760 2784 2829 2944 3040 3116 3280 3306 3335 3362 3480 3496 3567 3648 3680 3712 3772 3840 3895 3936 4002 4370 4408 4416 4560 4640 4674 4715 4756 4864 4920 5043 5244 5248 5336 5510 5520 5568 5658 5888 5945 6080 6232 6555 6560 6612 6670 6724 6960 6992 7134 7296 7360 7424 7544 7790 7872 8004 8265 8405 8740 8816 8832 9120 9280 9348 9430 9512 9840 10005 10086 10488 10496 10672 11020 11040 11136 11316 11685 11890 12160 12464 12673 13110 13120 13224 13340 13448 13920 13984 14145 14268 14592 14720 15088 15580 15744 16008 16530 16810 17480 17632 17664 17835 17917 18240 18560 18696 18860 19024 19680 20010 20172 20976 21344 22040 22080 22272 22591 22632 23370 23780 24320 24928 25215 25346 26220 26240 26448 26680 26896 27347 27840 27968 28290 28536 29440 30176 31160 31488 31939 32016 33060 33620 34960 35264 35670 35834 36480 37120 37392 37720 38019 38048 38663 39360 40020 40344 41952 42688 44080 44160 45182 45264 46740 47560 48749 49856 50430 50692 52440 52480 52896 53360 53751 53792 54694 55680 55936 56580 57072 60352 62320 63365 63878 64032 66120 67240 67773 69920 70528 71340 71668 72960 74784 75440 76038 76096 77326 78720 80040 80688 82041 83904 85376 88160 88320 89585 90364 90528 93480 95120 95817 97498 99712 100860 101384 104880 105792 106720 107502 107584 109388 111360 111872 112955 113160 114144 115989 120704 124640 126730 127756 128064 132240 134480 135546 136735 139840 141056 142680 143336 146247 149568 150880 152076 152192 154652 157440 159695 160080 161376 164082 167808 170752 176320 179170 180728 181056 186960 190095 190240 191634 193315 194996 199424 201720 202768 209760 211584 213440 215004 215168 218776 225910 226320 228288 231978 241408 243745 249280 253460 255512 256128 264480 268755 268960 271092 273470 279680 285360 286672 292494 299136 301760 304152 304384 309304 319390 320160 322752 328164 335616 338865 352640 358340 361456 362112 373920 380190 380480 383268 386630 389992 403440 405536 410205 419520 423168 426880 430008 430336 437552 451820 452640 456576 463956 479085 487490 498560 506920 511024 512256 519593 528960 537510 537920 542184 546940 559360 570720 573344 579945 584988 598272 603520 608304 618608 638780 640320 645504 656328 677730 705280 716680 722912 724224 731235 734597 747840 760380 760960 766536 773260 779984 806880 811072 820410 839040 853760 860016 875104 903640 905280 913152 926231 927912 958170 974980 997120 1013840 1022048 1039186 1057920 1075020 1075840 1084368 1093880 1121227 1141440 1146688 1159890 1169976 1207040 1216608 1237216 1277560 1280640 1291008 1312656 1355460 1433360 1445824 1462470 1469194 1495680 1520760 1521920 1533072 1546520 1558779 1559968 1613760 1622144 1640820 1678080 1720032 1750208 1807280 1810560 1852462 1855824 1916340 1949960 2027680 2044096 2078372 2115840 2150040 2151680 2168736 2187760 2203791 2242454 2282880 2293376 2319780 2339952 2433216 2474432 2555120 2561280 2597965 2625312 2710920 2778693 2866720 2891648 2924940 2938388 2991360 3041520 3066144 3093040 3117558 3119936 3227520 3244288 3281640 3363681 3440064 3500416 3614560 3621120 3672985 3704924 3711648 3832680 3899920 4055360 4088192 4156744 4300080 4337472 4375520 4407582 4484908 4565760 4586752 4631155 4639560 4679904 4866432 4948864 5110240 5195930 5250624 5421840 5557386 5606135 5733440 5783296 5849880 5876776 6083040 6132288 6186080 6235116 6239872 6455040 6563280 6727362 6880128 7000832 7229120 7345970 7409848 7423296 7665360 7793895 7799840 8110720 8176384 8313488 8600160 8674944 8751040 8815164 8969816 9262310 9279120 9359808 9732864 9897728 10220480 10391860 10501248 10843680 11018955 11114772 11212270 11466880 11699760 11753552 12166080 12264576 12372160 12470232 12479744 13126560 13454724 13760256 13893465 14458240 14691940 14819696 14846592 15330720 15587790 15599680 16221440 16626976 16818405 17200320 17349888 17502080 17630328 17939632 18524620 18558240 18719616 20440960 20783720 21002496 21303313 21687360 22037910 22229544 22424540 22933760 23399520 23507104 24332160 24529152 24744320 24940464 26253120 26909448 27786930 28916480 29383880 29639392 29693184 30661440 31175580 31199360 33253952 33636810 34400640 35004160 35260656 35879264 37049240 37116480 37439232 40881920 41567440 42606626 43374720 44075820 44459088 44849080 46799040 47014208 48664320 49488640 49880928 52506240 53818896 55573860 58767760 59278784 61322880 62351160 62398720 63909939 66507904 67273620 68801280 70521312 71758528 74098480 74232960 83134880 85213252 86749440 88151640 88918176 89698160 93598080 94028416 99761856 105012480 106516565 107637792 111147720 117535520 118557568 122645760 124702320 127819878 133015808 134547240 141042624 143517056 148196960 148465920 166269760 170426504 176303280 177836352 179396320 187196160 188056832 199523712 213033130 215275584 222295440 235071040 237115136 249404640 255639756 269094480 282085248 287034112 296393920 319549695 332539520 340853008 352606560 355672704 358792640 399047424 426066260 430551168 444590880 470142080 498809280 511279512 538188960 564170496 592787840 639099390 665079040 681706016 705213120 711345408 717585280 852132520 861102336 889181760 940284160 997618560 1022559024 1076377920 1185575680 1278198780 1363412032 1410426240 1435170560 1704265040 1778363520 1995237120 2045118048 2152755840 2556397560 2726824064 2820852480 3408530080 3556727040 4090236096 4305511680 5112795120 5453648128 6817060160 8180472192 10225590240 13634120320 16360944384 20451180480 27268240640 40902360960 81804721920
• Sum of all divisors σ(n): 304284556800
• Sum of proper divisors (its aliquot sum) s(n): 222479834880
• 81804721920 is an abundant number, because the sum of its proper divisors (222479834880) is greater than itself. Its abundance is 140675112960

Bases of 81804721920

• Binary: 1001100001011111100001111111100000000₂
• Hexadecimal: 0x130BF0FF00
• Base-36: 11KWF3EO

Squares and roots of 81804721920

• 81804721920 squared (81804721920²) is 6692012528408528486400
• 81804721920 cubed (81804721920³) is 547438223971615772986350501888000
• The square root of 81804721920 is 286015.2477054327
• The cube root of 81804721920 is 4341.0300371813

Scales and comparisons

• 81,804,721,920 seconds is equal to 2,601 years, 7 weeks, 21 hours, 52 minutes.
• To count from 1 to 81,804,721,920 would take you about five thousand, two hundred two 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 81804721920 cubic inches would be around 361.8 feet tall.

Recreational maths with 81804721920

• 81804721920 backwards is 02912740818
• The number of decimal digits it has is: 11
• The sum of 81804721920's digits is 42
• More coming soon!