81478509840

Names of 81478509840

• Cardinal: 81478509840 can be written as Eighty-one billion, four hundred seventy-eight million, five hundred nine thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.147850984 × 10¹⁰

Factors of 81478509840

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 378

Divisors of 81478509840

• Number of divisors d(n): 1080
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 20 21 24 26 28 30 34 35 36 39 40 42 45 48 51 52 56 60 63 65 68 70 72 78 80 84 85 90 91 102 104 105 112 117 119 120 126 130 136 140 144 153 156 168 169 170 180 182 195 204 208 210 221 234 238 240 252 255 260 272 273 280 289 306 312 315 331 336 338 340 357 360 364 390 408 420 442 455 468 476 504 507 510 520 546 560 578 585 595 612 624 630 662 663 676 680 714 720 728 765 780 816 819 840 845 867 884 910 936 952 993 1008 1014 1020 1040 1071 1092 1105 1156 1170 1183 1190 1224 1260 1324 1326 1352 1360 1365 1428 1445 1456 1521 1530 1547 1560 1638 1655 1680 1690 1734 1768 1785 1820 1872 1904 1986 1989 2023 2028 2040 2142 2184 2210 2312 2317 2340 2366 2380 2448 2520 2535 2601 2648 2652 2704 2730 2856 2873 2890 2979 3042 3060 3094 3120 3276 3310 3315 3380 3468 3536 3549 3570 3640 3757 3972 3978 4046 4056 4080 4095 4284 4303 4335 4368 4420 4624 4634 4641 4680 4732 4760 4965 5040 5070 5202 5296 5304 5355 5460 5627 5712 5746 5780 5915 5958 6069 6084 6120 6188 6552 6620 6630 6760 6936 6951 7098 7140 7280 7514 7605 7735 7944 7956 8092 8112 8190 8568 8606 8619 8670 8840 9268 9282 9360 9464 9520 9930 9945 10115 10140 10404 10608 10647 10710 10920 11254 11271 11492 11560 11585 11830 11916 12138 12168 12240 12376 12909 13005 13104 13240 13260 13520 13872 13902 13923 14196 14280 14365 14895 15028 15210 15470 15888 15912 16184 16380 16881 17136 17212 17238 17340 17680 17745 18207 18536 18564 18785 18928 19860 19890 20111 20230 20280 20808 20853 21294 21420 21515 21840 22508 22542 22984 23120 23170 23205 23660 23832 24276 24336 24752 25818 25857 26010 26299 26480 26520 27804 27846 28135 28392 28560 28730 29790 30056 30121 30345 30420 30940 31824 32368 32760 33762 33813 34424 34476 34680 34755 35490 36414 37072 37128 37570 38727 39389 39720 39780 40222 40460 40560 41616 41706 42588 42840 43030 43095 45016 45084 45968 46340 46410 47320 47664 48552 48841 50643 51636 51714 52020 52598 53040 53235 55608 55692 55939 56270 56355 56784 57460 59580 60112 60242 60333 60690 60840 61880 64545 65520 67524 67626 68848 68952 69360 69510 69615 70980 72828 73151 74256 75140 77454 78778 78897 79440 79560 80444 80920 83412 84405 85176 85680 86060 86190 90032 90168 90363 91035 92680 92820 94640 95659 97104 97682 100555 101286 103272 103428 104040 104265 105196 106470 111216 111384 111878 112540 112710 114920 118167 119160 120484 120666 121380 121680 123760 129090 129285 131495 135048 135252 137904 139020 139230 141960 145656 146302 146523 150280 150605 154908 157556 157794 159120 160888 161840 166824 167817 168810 169065 170352 172120 172380 180336 180726 180999 182070 185360 185640 191318 193635 195364 196945 201110 202572 206544 206856 208080 208530 210392 212940 219453 222768 223756 225080 225420 229840 236334 236691 238320 240968 241332 242760 244205 253215 258180 258570 262990 270096 270504 271089 278040 278460 279695 283920 286977 291312 292604 293046 300560 301210 301665 309816 315112 315588 321776 333648 335634 337620 338130 341887 344240 344760 354501 361452 361998 364140 365755 371280 382636 387270 390728 391573 393890 394485 402220 405144 413712 417060 420784 425880 438906 439569 447512 450160 450840 451815 472668 473382 478295 481936 482664 485520 488410 503451 506430 512057 516360 517140 525980 541008 542178 556080 556920 559390 573954 585208 586092 590835 602420 603330 619632 630224 631176 658359 669613 671268 675240 676260 683774 689520 709002 722904 723996 728280 731510 732615 765272 774540 781456 783146 787780 788970 804440 810288 834120 839085 851760 860931 877812 879138 895024 901680 903630 904995 945336 946764 950963 956590 965328 976820 1006902 1012860 1024114 1025661 1032720 1034280 1051960 1084356 1097265 1113840 1118780 1147908 1170416 1172184 1174719 1181670 1183455 1204840 1206660 1243567 1262352 1316718 1339226 1342536 1350480 1352520 1355445 1367548 1418004 1434885 1445808 1447992 1456560 1463020 1465230 1530544 1536171 1549080 1566292 1575560 1577940 1608880 1668240 1678170 1709435 1721862 1755624 1758276 1772505 1807260 1809990 1890672 1893528 1901926 1913180 1953640 1957865 2008839 2013804 2025720 2048228 2051322 2068560 2103920 2168712 2194530 2197845 2237560 2295816 2344368 2349438 2363340 2366910 2409680 2413320 2487134 2517255 2560285 2633436 2678452 2685072 2705040 2710890 2735096 2836008 2852889 2869770 2895984 2926040 2930460 3072342 3076983 3098160 3132584 3151120 3155880 3291795 3348065 3356340 3418870 3443724 3511248 3516552 3524157 3545010 3614520 3619980 3730701 3787056 3803852 3826360 3907280 3915730 4017678 4027608 4051440 4096456 4102644 4304655 4337424 4389060 4395690 4475120 4591632 4608513 4698876 4726680 4733820 4754815 4826640 4974268 5034510 5120570 5128305 5266872 5356904 5421780 5470192 5672016 5705778 5739540 5852080 5860920 5873595 6026517 6144684 6153966 6217835 6265168 6311760 6583590 6656741 6696130 6712680 6837740 6887448 7033104 7048314 7090020 7229040 7239960 7461402 7607704 7652720 7680855 7831460 8035356 8055216 8192912 8205288 8558667 8609310 8704969 8778120 8791380 9217026 9397752 9453360 9467640 9509630 9948536 10044195 10069020 10241140 10256610 10533744 10713808 10843560 11192103 11411556 11479080 11721840 11747190 12053034 12289368 12307932 12435670 13167180 13313482 13392260 13425360 13675480 13774896 14096628 14180040 14264445 14479920 14922804 15215408 15361710 15384915 15662920 16070712 16166371 16410576 17117334 17218620 17409938 17556240 17582760 17620785 18434052 18653505 18795504 18935280 19019260 19897072 19970223 20088390 20138040 20482280 20513220 21687120 22384206 22823112 22958160 23042565 23494380 24106068 24578736 24615864 24871340 26114907 26334360 26626964 26784520 27350960 28193256 28360080 28528890 29845608 30132585 30723420 30769830 31325840 32141424 32332742 33283705 34234668 34437240 34819876 35165520 35241570 36868104 37307010 38038520 39940446 40176780 40276080 40964560 41026440 42793335 43524845 44768412 45646224 46085130 46988760 48212136 48499113 49231728 49742680 52229814 52668720 53253928 53569040 55960515 56386512 57057780 59691216 59910669 60265170 61446840 61539660 64665484 66567410 68469336 68874480 69639752 70483140 73736208 74614020 76077040 78344721 79880892 80353560 80831855 82052880 85586670 87049690 89536824 92170260 93977520 96424272 96998226 99485360 99851115 104459628 106507856 111921030 113164597 114115560 119821338 120530340 122893680 123079320 129330968 130574535 133134820 136938672 139279504 140966280 145497339 149228040 156689442 159761784 160707120 161663710 171173340 174099380 179073648 184340520 193996452 199702230 208919256 223842060 226329194 228231120 239642676 241060680 242495565 246158640 258661936 261149070 266269640 281932560 290994678 298456080 299553345 313378884 319523568 323327420 339493791 342346680 348198760 368681040 387992904 391723605 399404460 417838512 447684120 452658388 479285352 482121360 484991130 522298140 532539280 565822985 581989356 599106690 626757768 646654840 678987582 684693360 696397520 727486695 775985808 783447210 798808920 895368240 905316776 958570704 969982260 1018481373 1044596280 1131645970 1163978712 1198213380 1253515536 1293309680 1357975164 1454973390 1566894420 1597617840 1697468955 1810633552 1939964520 2036962746 2089192560 2263291940 2327957424 2396426760 2715950328 2909946780 3133788840 3394937910 3879929040 4073925492 4526583880 4792853520 5092406865 5431900656 5819893560 6267577680 6789875820 8147850984 9053167760 10184813730 11639787120 13579751640 16295701968 20369627460 27159503280 40739254920 81478509840
• Sum of all divisors σ(n): 360806067648
• Sum of proper divisors (its aliquot sum) s(n): 279327557808
• 81478509840 is an abundant number, because the sum of its proper divisors (279327557808) is greater than itself. Its abundance is 197849047968

Bases of 81478509840

• Binary: 1001011111000011111110110010100010000₂
• Hexadecimal: 0x12F87F6510
• Base-36: 11FI78K0

Squares and roots of 81478509840

• 81478509840 squared (81478509840²) is 6638747565746976825600
• 81478509840 cubed (81478509840³) is 540915258860991098234901563904000
• The square root of 81478509840 is 285444.4076173153
• The cube root of 81478509840 is 4335.2521191317

Scales and comparisons

• 81,478,509,840 seconds is equal to 2,590 years, 39 weeks, 5 days, 7 hours, 24 minutes.
• To count from 1 to 81,478,509,840 would take you about five thousand, one hundred eighty-one 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 81478509840 cubic inches would be around 361.3 feet tall.

Recreational maths with 81478509840

• 81478509840 backwards is 04890587418
• The number of decimal digits it has is: 11
• The sum of 81478509840's digits is 54
• More coming soon!