81646381440

Names of 81646381440

• Cardinal: 81646381440 can be written as Eighty-one billion, six hundred forty-six million, three hundred eighty-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.164638144 × 10¹⁰

Factors of 81646381440

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 2140

Divisors of 81646381440

• Number of divisors d(n): 768
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 16 17 18 20 24 26 30 31 32 34 36 39 40 45 48 51 52 60 62 64 65 68 72 78 80 85 90 93 96 102 104 117 120 124 128 130 136 144 153 155 156 160 170 180 186 192 195 204 208 221 234 240 248 255 260 272 279 288 306 310 312 320 340 360 372 384 390 403 408 416 442 465 468 480 496 510 520 527 544 558 576 585 612 620 624 640 663 680 720 744 765 780 806 816 832 884 930 936 960 992 1020 1040 1054 1088 1105 1116 1152 1170 1209 1224 1240 1248 1326 1360 1395 1440 1488 1530 1560 1581 1612 1632 1664 1768 1860 1872 1920 1984 1989 2015 2040 2069 2080 2108 2176 2210 2232 2340 2418 2448 2480 2496 2635 2652 2720 2790 2880 2976 3060 3120 3162 3224 3264 3315 3536 3627 3720 3744 3968 3978 4030 4080 4138 4160 4216 4420 4464 4680 4743 4836 4896 4960 4992 5270 5304 5440 5580 5760 5952 6045 6120 6207 6240 6324 6448 6528 6630 6851 7072 7254 7440 7488 7905 7956 8060 8160 8276 8320 8432 8840 8928 9360 9486 9672 9792 9920 9945 10345 10540 10608 10880 11160 11904 12090 12240 12414 12480 12648 12896 13260 13702 14144 14508 14880 14976 15810 15912 16120 16320 16552 16864 17680 17856 18135 18621 18720 18972 19344 19584 19840 19890 20553 20690 21080 21216 22320 23715 24180 24480 24828 24960 25296 25792 26520 26897 27404 28288 29016 29760 31035 31620 31824 32240 32640 33104 33728 34255 35173 35360 35712 36270 37242 37440 37944 38688 39780 41106 41380 42160 42432 44640 47430 48360 48960 49656 50592 51584 53040 53794 54808 58032 59520 61659 62070 63240 63648 64139 64480 66208 67456 68510 70346 70720 72540 74484 74880 75888 77376 79560 80691 82212 82760 84320 84864 89280 93105 94860 96720 97920 99312 101184 102765 105519 106080 107588 109616 116064 123318 124140 126480 127296 128278 128960 132416 134485 137020 140692 141440 145080 148968 151776 154752 159120 161382 164424 165520 168640 175865 178560 186210 189720 192417 193440 198624 202368 205530 211038 212160 215176 219232 232128 242073 246636 248280 252960 254592 256556 257920 264832 268970 274040 281384 290160 297936 303552 308295 316557 318240 320695 322764 328848 331040 337280 351730 372420 379440 384834 386880 397248 403455 411060 422076 424320 430352 438464 457249 464256 484146 493272 496560 505920 513112 527595 537940 548080 562768 577251 580320 595872 607104 616590 633114 636480 641390 645528 657696 662080 703460 744840 758880 769668 773760 794496 806910 822120 833807 844152 860704 876928 914498 962085 968292 986544 993120 1011840 1026224 1055190 1075880 1090363 1096160 1125536 1154502 1160640 1191744 1210365 1233180 1266228 1272960 1282780 1291056 1315392 1324160 1371747 1406920 1489680 1517760 1539336 1582785 1613820 1644240 1667614 1688304 1721408 1828996 1924170 1936584 1973088 1986240 2052448 2110380 2151760 2180726 2192320 2251072 2286245 2309004 2321280 2383488 2420730 2466360 2501421 2532456 2565560 2582112 2630784 2743494 2813840 2886255 2979360 3035520 3078672 3165570 3227640 3271089 3288480 3335228 3376608 3442816 3657992 3848340 3873168 3946176 3972480 4104896 4115241 4169035 4220760 4303520 4361452 4384640 4502144 4572490 4618008 4841460 4932720 5002842 5064912 5131120 5164224 5451815 5486988 5627680 5772510 5958720 6157344 6331140 6455280 6542178 6576960 6670456 6753216 6858735 7315984 7504263 7696680 7746336 7892352 8209792 8230482 8338070 8441520 8607040 8722904 9144980 9236016 9682920 9813267 9865440 10005684 10129824 10262240 10328448 10903630 10973976 11255360 11545020 11917440 12314688 12507105 12662280 12910560 13084356 13153920 13340912 13506432 13717470 14174719 14631968 15008526 15393360 15492672 16355445 16460964 16676140 16883040 17214080 17445808 18289960 18472032 19365840 19626534 19730880 20011368 20259648 20524480 20576205 21807260 21947952 22510720 23090040 24629376 25014210 25324560 25821120 26168712 26681824 27434940 28349438 29263936 30017052 30786720 30985344 32710890 32921928 33352280 33766080 34891616 36579920 36944064 37521315 38731680 39253068 39461760 40022736 40519296 41048960 41152410 42524157 43614520 43895904 46180080 49066335 50028420 50649120 51642240 52337424 53363648 54869880 56698876 58527872 60034104 61573440 65421780 65843856 66704560 67532160 69783232 70873595 73159840 73888128 75042630 77463360 78506136 80045472 82304820 85048314 87229040 87791808 92360160 98132670 100056840 101298240 104674848 106727296 109739760 113397752 120068208 123146880 127572471 130843560 131687712 133409120 139566464 141747190 146319680 150085260 154926720 157012272 160090944 164609640 170096628 174458080 175583616 184720320 196265340 200113680 202596480 209349696 212620785 219479520 226795504 240136416 255144942 261687120 263375424 266818240 283494380 292639360 300170520 314024544 320181888 329219280 340193256 348916160 369440640 392530680 400227360 418699392 425241570 438959040 453591008 480272832 510289884 523374240 526750848 533636480 566988760 600341040 628049088 637862355 658438560 680386512 697832320 785061360 800454720 850483140 877918080 907182016 960545664 1020579768 1046748480 1133977520 1200682080 1256098176 1275724710 1316877120 1360773024 1570122720 1600909440 1700966280 1814364032 2041159536 2093496960 2267955040 2401364160 2551449420 2633754240 2721546048 3140245440 3401932560 4082319072 4535910080 4802728320 5102898840 5443092096 6280490880 6803865120 8164638144 9071820160 10205797680 13607730240 16329276288 20411595360 27215460480 40823190720 81646381440
• Sum of all divisors σ(n): 332013427200
• Sum of proper divisors (its aliquot sum) s(n): 250367045760
• 81646381440 is an abundant number, because the sum of its proper divisors (250367045760) is greater than itself. Its abundance is 168720664320

Bases of 81646381440

• Binary: 1001100000010100000001110100110000000₂
• Hexadecimal: 0x130280E980
• Base-36: 11IA5B40

Squares and roots of 81646381440

• 81646381440 squared (81646381440²) is 6666131602245976473600
• 81646381440 cubed (81646381440³) is 544265523526213355868811689984000
• The square root of 81646381440 is 285738.3093671551
• The cube root of 81646381440 is 4338.2274086605

Scales and comparisons

• 81,646,381,440 seconds is equal to 2,596 years, 5 weeks, 2 days, 6 hours, 24 minutes.
• To count from 1 to 81,646,381,440 would take you about five thousand, one hundred ninety-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 81646381440 cubic inches would be around 361.5 feet tall.

Recreational maths with 81646381440

• 81646381440 backwards is 04418364618
• 81646381440 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81646381440's digits is 45
• More coming soon!