81998737920

Names of 81998737920

• Cardinal: 81998737920 can be written as Eighty-one billion, nine hundred ninety-eight million, seven hundred thirty-seven thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 8.199873792 × 10¹⁰

Factors of 81998737920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 16
• Sum of prime factors: 527

Divisors of 81998737920

• Number of divisors d(n): 720
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 32 33 36 40 44 45 48 55 60 64 66 67 72 80 88 90 96 99 110 120 121 128 132 134 144 160 165 176 180 192 198 201 220 240 242 256 264 268 288 320 330 335 352 360 363 384 396 402 439 440 480 484 495 512 528 536 576 603 605 640 660 670 704 720 726 737 768 792 804 878 880 960 968 990 1005 1056 1072 1089 1152 1206 1210 1280 1317 1320 1340 1408 1440 1452 1474 1536 1584 1608 1756 1760 1815 1920 1936 1980 2010 2112 2144 2178 2195 2211 2304 2412 2420 2560 2634 2640 2680 2816 2880 2904 2948 3015 3168 3216 3512 3520 3630 3685 3840 3872 3951 3960 4020 4224 4288 4356 4390 4422 4608 4824 4829 4840 5268 5280 5360 5445 5632 5760 5808 5896 6030 6336 6432 6585 6633 7024 7040 7260 7370 7680 7744 7902 7920 8040 8107 8448 8576 8712 8780 8844 9648 9658 9680 10536 10560 10720 10890 11055 11520 11616 11792 12060 12672 12864 13170 13266 14048 14080 14487 14520 14740 15488 15804 15840 16080 16214 16896 17152 17424 17560 17688 19296 19316 19360 19755 21072 21120 21440 21780 22110 23040 23232 23584 24120 24145 24321 25344 25728 26340 26532 28096 28160 28974 29040 29413 29480 30976 31608 31680 32160 32428 33165 34304 34848 35120 35376 38592 38632 38720 39510 40535 42144 42240 42880 43461 43560 44220 46464 47168 48240 48290 48642 50688 51456 52680 53064 53119 56192 57948 58080 58826 58960 61952 63216 63360 64320 64856 66330 69696 70240 70752 72435 72963 77184 77264 77440 79020 81070 84288 84480 85760 86922 87120 88239 88440 92928 94336 96480 96580 97284 102912 105360 106128 106238 112384 115896 116160 117652 117920 121605 126432 126720 128640 129712 132660 139392 140480 141504 144870 145926 147065 154368 154528 154880 158040 159357 162140 168576 171520 173844 174240 176478 176880 185856 188672 192960 193160 194568 210720 212256 212476 217305 224768 231792 232320 235304 235840 243210 252864 253440 257280 259424 264717 265320 265595 278784 280960 283008 289740 291852 294130 308736 309056 309760 316080 318714 323543 324280 337152 347688 348480 352956 353760 364815 377344 385920 386320 389136 421440 424512 424952 434610 441195 463584 464640 470608 471680 478071 486420 505728 514560 518848 529434 530640 531190 557568 561920 566016 579480 583704 588260 618112 632160 637428 647086 648560 674304 695376 696960 705912 707520 729630 771840 772640 778272 796785 842880 849024 849904 869220 882390 927168 929280 941216 943360 956142 970629 972840 1011456 1037696 1058868 1061280 1062380 1123840 1132032 1158960 1167408 1176520 1236224 1264320 1274856 1294172 1297120 1323585 1390752 1393920 1411824 1415040 1459260 1543680 1545280 1556544 1593570 1617715 1685760 1698048 1699808 1738440 1764780 1854336 1882432 1886720 1912284 1941258 1945680 2022912 2075392 2117736 2122560 2124760 2317920 2334816 2353040 2390355 2472448 2528640 2549712 2588344 2594240 2647170 2781504 2787840 2823648 2830080 2911887 2918520 3090560 3113088 3187140 3235430 3371520 3396096 3399616 3476880 3529560 3558973 3708672 3764864 3824568 3882516 3891360 4150784 4235472 4245120 4249520 4635840 4669632 4706080 4780710 4853145 5057280 5099424 5176688 5188480 5294340 5563008 5647296 5660160 5823774 5837040 6181120 6226176 6374280 6470860 6799232 6953760 7059120 7117946 7417344 7529728 7649136 7765032 7782720 8470944 8490240 8499040 9271680 9339264 9412160 9561420 9706290 10114560 10198848 10353376 10376960 10588680 10676919 11126016 11294592 11647548 11674080 12362240 12452352 12748560 12941720 13598464 13907520 14118240 14235892 14559435 15059456 15298272 15530064 15565440 16941888 16980480 16998080 17794865 18543360 18678528 18824320 19122840 19412580 20397696 20706752 20753920 21177360 21353838 22252032 22589184 23295096 23348160 25497120 25883440 27196928 27815040 28236480 28471784 29118870 30596544 31060128 31130880 32030757 33883776 33996160 35589730 37086720 37357056 37648640 38245680 38825160 40795392 41413504 42354720 42707676 45178368 46590192 46696320 50994240 51766880 53384595 55630080 56472960 56943568 58237740 61193088 62120256 62261760 64061514 67767552 67992320 71179460 75297280 76491360 77650320 81590784 82827008 84709440 85415352 93180384 93392640 101988480 103533760 106769190 111260160 112945920 113887136 116475480 122386176 124240512 128123028 135535104 135984640 142358920 152982720 155300640 160153785 165654016 169418880 170830704 186360768 186785280 203976960 207067520 213538380 225891840 227774272 232950960 244772352 248481024 256246056 284717840 305965440 310601280 320307570 338837760 341661408 372721536 407953920 414135040 427076760 455548544 465901920 496962048 512492112 569435680 611930880 621202560 640615140 677675520 683322816 745443072 828270080 854153520 911097088 931803840 1024984224 1138871360 1223861760 1242405120 1281230280 1366645632 1490886144 1708307040 1822194176 1863607680 2049968448 2277742720 2484810240 2562460560 2733291264 3416614080 3727215360 4099936896 4555485440 5124921120 5466582528 6833228160 7454430720 8199873792 9110970880 10249842240 13666456320 16399747584 20499684480 27332912640 40999368960 81998737920
• Sum of all divisors σ(n): 317529051840
• Sum of proper divisors (its aliquot sum) s(n): 235530313920
• 81998737920 is an abundant number, because the sum of its proper divisors (235530313920) is greater than itself. Its abundance is 153531576000

Bases of 81998737920

• Binary: 1001100010111100000010111001000000000₂
• Hexadecimal: 0x1317817200
• Base-36: 11O3XJ40

Squares and roots of 81998737920

• 81998737920 squared (81998737920²) is 6723793020472845926400
• 81998737920 cubed (81998737920³) is 551342541714078087595413209088000
• The square root of 81998737920 is 286354.2175697785
• The cube root of 81998737920 is 4344.4591966981

Scales and comparisons

• 81,998,737,920 seconds is equal to 2,607 years, 15 weeks, 6 days, 11 hours, 12 minutes.
• To count from 1 to 81,998,737,920 would take you about five thousand, two hundred fourteen 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 81998737920 cubic inches would be around 362 feet tall.

Recreational maths with 81998737920

• 81998737920 backwards is 02973789918
• The number of decimal digits it has is: 11
• The sum of 81998737920's digits is 63
• More coming soon!