81728343840

Names of 81728343840

• Cardinal: 81728343840 can be written as Eighty-one billion, seven hundred twenty-eight million, three hundred forty-three thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.172834384 × 10¹⁰

Factors of 81728343840

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 445

Divisors of 81728343840

• Number of divisors d(n): 768
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 13 15 16 20 22 24 26 30 32 33 39 40 41 44 48 52 55 60 65 66 78 80 82 88 96 104 110 113 120 123 130 132 143 156 160 164 165 176 195 205 208 220 226 240 246 257 260 264 286 312 328 330 339 352 390 410 416 429 440 451 452 480 492 514 520 528 533 565 572 615 624 656 660 678 715 771 780 820 858 880 902 904 984 1028 1040 1056 1066 1130 1144 1230 1243 1248 1285 1312 1320 1353 1356 1430 1469 1542 1560 1599 1640 1695 1716 1760 1804 1808 1968 2056 2080 2132 2145 2255 2260 2288 2460 2486 2570 2640 2665 2706 2712 2827 2860 2938 3084 3120 3198 3280 3341 3390 3432 3608 3616 3729 3855 3936 4112 4264 4290 4407 4510 4520 4576 4633 4920 4972 5140 5280 5330 5412 5424 5654 5720 5863 5876 6168 6215 6240 6396 6560 6682 6765 6780 6864 7216 7345 7458 7710 7995 8224 8481 8528 8580 8814 9020 9040 9266 9840 9944 10023 10280 10537 10660 10824 10848 11308 11440 11726 11752 12336 12430 12792 13364 13530 13560 13728 13899 14135 14432 14690 14916 15420 15990 16159 16705 16962 17056 17160 17589 17628 18040 18080 18532 18645 19680 19888 20046 20560 21074 21320 21648 22035 22616 22880 23165 23452 23504 24672 24860 25584 26728 27060 27120 27798 28270 29041 29315 29380 29832 30840 31611 31980 32318 33410 33924 34320 35178 35256 36080 36751 37064 37290 39776 40092 41120 42148 42405 42640 43296 44070 45232 46330 46904 47008 48477 49720 50115 50963 51168 52685 53456 54120 54240 55596 56540 58082 58630 58760 59664 60229 61680 63222 63960 64636 66820 67848 68640 69495 70356 70512 72160 73502 74128 74580 80184 80795 84296 84810 85280 87123 87945 88140 90464 92660 93808 96954 99440 100230 101926 105370 106912 108240 110253 111192 113080 115907 116164 117260 117520 119328 120458 123360 126444 127920 129272 133640 135696 136981 138990 140712 141024 145205 147004 148256 149160 152889 158055 160368 161590 168592 169620 174246 175890 176280 180687 183755 185320 187616 193908 198880 200460 203852 210740 216480 220506 222384 226160 231814 232328 234520 235040 240916 242385 252888 254815 255840 258544 267280 271392 273962 277980 281424 290410 294008 298320 301145 305778 316110 319451 320736 323180 337184 339240 347721 348492 351780 352560 361374 367510 370640 377533 387816 400920 407704 410943 421480 435615 441012 444768 452320 463628 464656 469040 481832 484770 505776 509630 517088 534560 547924 551265 555960 562848 579535 580820 588016 596640 602290 611556 632220 638902 646360 662519 678480 684905 695442 696984 703560 705120 722748 735020 741280 755066 764445 775632 801840 815408 821886 842960 871230 882024 903435 927256 929312 938080 958353 963664 969540 1011552 1019260 1095848 1102530 1111920 1132599 1159070 1161640 1176032 1190681 1204580 1223112 1264440 1277804 1292720 1325038 1356960 1369810 1390884 1393968 1407120 1445496 1470040 1506791 1510132 1528890 1551264 1597255 1603680 1630816 1643772 1685920 1738605 1742460 1764048 1806870 1854512 1887665 1916706 1927328 1939080 1987557 2038520 2054715 2191696 2205060 2223840 2265198 2318140 2323280 2381362 2409160 2446224 2528880 2555608 2585440 2650076 2739620 2781768 2787936 2814240 2890992 2940080 3013582 3020264 3057780 3194510 3287544 3312595 3477210 3484920 3528096 3572043 3613740 3709024 3775330 3833412 3878160 3975114 4077040 4109430 4152863 4383392 4410120 4520373 4530396 4636280 4646560 4762724 4791765 4818320 4892448 5057760 5111216 5300152 5479240 5563536 5662995 5781984 5880160 5953405 6027164 6040528 6115560 6389020 6575088 6625190 6954420 6969840 7144086 7227480 7533955 7550660 7666824 7756320 7950228 8154080 8218860 8305726 8820240 9040746 9060792 9272560 9525448 9583530 9636640 9937785 10222432 10600304 10958480 11127072 11325990 11906810 12054328 12081056 12231120 12458589 12778040 13097491 13150176 13250380 13908840 13939680 14288172 14454960 15067910 15101320 15333648 15478853 15900456 16437720 16611452 17640480 17860215 18081492 18121584 18545120 19050896 19167060 19875570 20764315 21200608 21916960 22601865 22651980 23813620 24108656 24462240 24917178 25556080 26194982 26500760 27817680 28576344 28909920 30135820 30202640 30667296 30957706 31800912 32875440 33222904 35720430 36162984 36243168 38101792 38334120 39292473 39751140 41528630 45203730 45303960 46436559 47627240 48217312 49834356 51112160 52389964 53001520 55635360 57152688 60271640 60405280 61915412 62292945 63601824 65487455 65750880 66445808 71440860 72325968 76668240 77394265 78584946 79502280 83057260 90407460 90607920 92873118 95254480 99668712 104779928 106003040 114305376 120543280 123830824 124585890 130974910 132891616 142881720 144651936 153336480 154788530 157169892 159004560 166114520 170267383 180814920 181215840 185746236 190508960 196462365 199337424 209559856 232182795 241086560 247661648 249171780 261949820 285763440 309577060 314339784 318009120 332229040 340534766 361629840 371492472 392924730 398674848 419119712 464365590 495323296 498343560 510802149 523899640 571526880 619154120 628679568 664458080 681069532 723259680 742984944 785849460 851336915 928731180 996687120 1021604298 1047799280 1238308240 1257359136 1362139064 1485969888 1571698920 1702673830 1857462360 1993374240 2043208596 2095598560 2476616480 2554010745 2724278128 3143397840 3405347660 3714924720 4086417192 5108021490 5448556256 6286795680 6810695320 7429849440 8172834384 10216042980 13621390640 16345668768 20432085960 27242781280 40864171920 81728343840
• Sum of all divisors σ(n): 313786980864
• Sum of proper divisors (its aliquot sum) s(n): 232058637024
• 81728343840 is an abundant number, because the sum of its proper divisors (232058637024) is greater than itself. Its abundance is 150330293184

Bases of 81728343840

• Binary: 1001100000111011000111000111100100000₂
• Hexadecimal: 0x1307638F20
• Base-36: 11JMY1PC

Squares and roots of 81728343840

• 81728343840 squared (81728343840²) is 6679522186829265945600
• 81728343840 cubed (81728343840³) is 545906285972090966576799535104000
• The square root of 81728343840 is 285881.6955315607
• The cube root of 81728343840 is 4339.6785961171

Scales and comparisons

• 81,728,343,840 seconds is equal to 2,598 years, 36 weeks, 5 days, 21 hours, 44 minutes.
• To count from 1 to 81,728,343,840 would take you about five thousand, one hundred ninety-seven 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 81728343840 cubic inches would be around 361.6 feet tall.

Recreational maths with 81728343840

• 81728343840 backwards is 04834382718
• 81728343840 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81728343840's digits is 48
• More coming soon!