81439991360

Names of 81439991360

• Cardinal: 81439991360 can be written as Eighty-one billion, four hundred thirty-nine million, nine hundred ninety-one thousand, three hundred sixty.

Scientific notation

• Scientific notation: 8.143999136 × 10¹⁰

Factors of 81439991360

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 521

Divisors of 81439991360

• Number of divisors d(n): 504
• Complete list of divisors:
  1 2 4 5 7 8 10 13 14 16 20 26 28 32 35 40 49 52 56 64 65 70 73 80 91 98 104 112 130 140 146 160 169 182 196 208 224 245 260 280 292 320 338 364 365 392 416 421 448 455 490 511 520 560 584 637 676 728 730 784 832 842 845 910 949 980 1022 1040 1120 1168 1183 1274 1352 1456 1460 1568 1684 1690 1820 1898 1960 2044 2080 2105 2240 2336 2366 2548 2555 2704 2912 2920 2947 3136 3185 3368 3380 3577 3640 3796 3920 4088 4160 4210 4672 4732 4745 5096 5110 5408 5473 5824 5840 5894 5915 6370 6643 6736 6760 7154 7280 7592 7840 8176 8281 8420 9464 9490 10192 10220 10816 10946 11680 11788 11830 12337 12740 13286 13472 13520 14308 14560 14735 15184 15680 16352 16562 16840 17885 18928 18980 20384 20440 20629 21892 23360 23576 23660 24674 25480 26572 26944 27040 27365 28616 29120 29470 30368 30733 32704 33124 33215 33680 35770 37856 37960 38311 40768 40880 41258 41405 43784 46501 47152 47320 49348 50960 53144 54080 54730 57232 58940 60736 61466 61685 66248 66430 67360 71149 71540 75712 75920 76622 81760 82516 82810 86359 87568 93002 94304 94640 98696 101920 103145 106288 109460 114464 117880 122932 123370 132496 132860 134720 142298 143080 151840 153244 153665 163520 165032 165620 172718 175136 186004 188608 189280 191555 197392 203840 206290 212576 215131 218920 228928 232505 235760 245864 246740 264992 265720 268177 284596 286160 303680 306488 307330 330064 331240 345436 350272 355745 372008 378560 383110 394784 399529 412580 425152 430262 431795 437840 465010 471520 491728 493480 498043 529984 531440 536354 569192 572320 604513 612976 614660 660128 662480 690872 711490 744016 766220 789568 799058 825160 860524 863590 875680 930020 943040 983456 986960 996086 1062880 1072708 1075655 1138384 1144640 1209026 1225952 1229320 1320256 1324960 1340885 1381744 1422980 1488032 1505917 1532440 1598116 1650320 1721048 1727180 1751360 1860040 1966912 1973920 1992172 1997645 2125760 2145416 2151310 2276768 2418052 2451904 2458640 2490215 2649920 2681770 2763488 2796703 2845960 2976064 3011834 3022565 3064880 3196232 3300640 3442096 3454360 3486301 3720080 3947840 3984344 3995290 4290832 4302620 4553536 4836104 4917280 4980430 5193877 5363540 5526976 5593406 5691920 6023668 6045130 6129760 6392464 6601280 6884192 6908720 6972602 7440160 7529585 7968688 7990580 8581664 8605240 9672208 9834560 9960860 10387754 10727080 11186812 11383840 12047336 12090260 12259520 12784928 13768384 13817440 13945204 13983515 14880320 15059170 15937376 15981160 17163328 17210480 17431505 19344416 19576921 19921720 20775508 21454160 22373624 22767680 24094672 24180520 25569856 25969385 27634880 27890408 27967030 30118340 31874752 31962320 34420960 34863010 36357139 38688832 39153842 39843440 41551016 42908320 44747248 48189344 48361040 51938770 55780816 55934060 60236680 63924640 68841920 69726020 72714278 78307684 79686880 83102032 85816640 89494496 96378688 96722080 97884605 103877540 111561632 111868120 120473360 127849280 139452040 145428556 156615368 159373760 166204064 178988992 181785695 193444160 195769210 207755080 223123264 223736240 240946720 254499973 278904080 290857112 313230736 332408128 363571390 391538420 415510160 447472480 481893440 508999946 557808160 581714224 626461472 727142780 783076840 831020320 894944960 1017999892 1115616320 1163428448 1252922944 1272499865 1454285560 1566153680 1662040640 2035999784 2326856896 2544999730 2908571120 3132307360 4071999568 5089999460 5817142240 6264614720 8143999136 10179998920 11634284480 16287998272 20359997840 40719995680 81439991360
• Sum of all divisors σ(n): 248213322216
• Sum of proper divisors (its aliquot sum) s(n): 166773330856
• 81439991360 is an abundant number, because the sum of its proper divisors (166773330856) is greater than itself. Its abundance is 85333339496

Bases of 81439991360

• Binary: 1001011110110001100111010011001000000₂
• Hexadecimal: 0x12F633A640
• Base-36: 11EV9NI8

Squares and roots of 81439991360

• 81439991360 squared (81439991360²) is 6632472192716874649600
• 81439991360 cubed (81439991360³) is 540148478070302526389627027456000
• The square root of 81439991360 is 285376.9285699179
• The cube root of 81439991360 is 4334.5688565821

Scales and comparisons

• 81,439,991,360 seconds is equal to 2,589 years, 28 weeks, 11 hours, 49 minutes, 20 seconds.
• To count from 1 to 81,439,991,360 would take you about five thousand, one hundred seventy-nine 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 81439991360 cubic inches would be around 361.2 feet tall.

Recreational maths with 81439991360

• 81439991360 backwards is 06319993418
• The number of decimal digits it has is: 11
• The sum of 81439991360's digits is 53
• More coming soon!