81429391680

Names of 81429391680

• Cardinal: 81429391680 can be written as Eighty-one billion, four hundred twenty-nine million, three hundred ninety-one thousand, six hundred eighty.

Scientific notation

• Scientific notation: 8.142939168 × 10¹⁰

Factors of 81429391680

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 10273

Divisors of 81429391680

• Number of divisors d(n): 504
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 13 14 15 16 20 21 24 26 28 30 32 35 39 40 42 48 49 52 56 60 64 65 70 78 80 84 91 96 98 104 105 112 120 130 140 147 156 160 168 169 182 192 195 196 208 210 224 240 245 260 273 280 294 312 320 336 338 364 390 392 416 420 448 455 480 490 507 520 546 560 588 624 637 672 676 728 735 780 784 832 840 845 910 960 980 1014 1040 1092 1120 1176 1183 1248 1274 1344 1352 1365 1456 1470 1560 1568 1680 1690 1820 1911 1960 2028 2080 2184 2240 2352 2366 2496 2535 2548 2704 2730 2912 2940 3120 3136 3185 3360 3380 3549 3640 3822 3920 4056 4160 4368 4704 4732 5070 5096 5408 5460 5824 5880 5915 6240 6370 6720 6760 7098 7280 7644 7840 8112 8281 8736 9408 9464 9555 10140 10192 10243 10816 10920 11760 11830 12480 12740 13520 14196 14560 15288 15680 16224 16562 17472 17745 18928 19110 20280 20384 20486 21840 23520 23660 24843 25480 27040 28392 29120 30576 30729 32448 33124 35490 37856 38220 40560 40768 40972 41405 43680 47040 47320 49686 50960 51215 54080 56784 61152 61458 66248 70980 71701 75712 76440 81120 81944 82810 87360 94640 99372 101920 102430 113568 122304 122916 124215 132496 133159 141960 143402 152880 153645 162240 163888 165620 189280 198744 203840 204860 215103 227136 245832 248430 264992 266318 283920 286804 305760 307290 327776 331240 358505 378560 397488 399477 409720 430206 491664 496860 501907 529984 532636 567840 573608 611520 614580 655552 662480 665795 717010 794976 798954 819440 860412 932113 983328 993720 1003814 1065272 1075515 1135680 1147216 1229160 1324960 1331590 1434020 1505721 1589952 1597908 1638880 1720824 1731067 1864226 1966656 1987440 1997385 2007628 2130544 2151030 2294432 2458320 2509535 2649920 2663180 2796339 2868040 3011442 3195816 3277760 3441648 3462134 3728452 3974880 3994770 4015256 4261088 4302060 4588864 4660565 4916640 5019070 5193201 5326360 5592678 5736080 6022884 6391632 6524791 6883296 6924268 7456904 7528605 7949760 7989540 8030512 8522176 8604120 8655335 9321130 9833280 10038140 10386402 10652720 11185356 11472160 12045768 12117469 12783264 13049582 13766592 13848536 13981695 14913808 15057210 15979080 16061024 17208240 17310670 18642260 19574373 20076280 20772804 21305440 22370712 22944320 24091536 24234938 25566528 25966005 26099164 27697072 27963390 29827616 30114420 31958160 32122048 32623955 34416480 34621340 36352407 37284520 39148746 40152560 41545608 42610880 44741424 48183072 48469876 51932010 52198328 55394144 55926780 59655232 60228840 60587345 63916320 65247910 68832960 69242680 72704814 74569040 78297492 80305120 83091216 84822283 89482848 96366144 96939752 97871865 103864020 104396656 110788288 111853560 120457680 121174690 127832640 130495820 138485360 145409628 149138080 156594984 160610240 166182432 169644566 178965696 181762035 193879504 195743730 207728040 208793312 223707120 240915360 242349380 254466849 260991640 276970720 290819256 298276160 313189968 332364864 339289132 363524070 387759008 391487460 415456080 417586624 424111415 447414240 481830720 484698760 508933698 521983280 553941440 581638512 626379936 678578264 727048140 775518016 782974920 830912160 848222830 894828480 969397520 1017867396 1043966560 1163277024 1252759872 1272334245 1357156528 1454096280 1565949840 1661824320 1696445660 1938795040 2035734792 2087933120 2326554048 2544668490 2714313056 2908192560 3131899680 3392891320 3877590080 4071469584 5089336980 5428626112 5816385120 6263799360 6785782640 8142939168 10178673960 11632770240 13571565280 16285878336 20357347920 27143130560 40714695840 81429391680
• Sum of all divisors σ(n): 325694539872
• Sum of proper divisors (its aliquot sum) s(n): 244265148192
• 81429391680 is an abundant number, because the sum of its proper divisors (244265148192) is greater than itself. Its abundance is 162835756512

Bases of 81429391680

• Binary: 1001011110101100100011110100101000000₂
• Hexadecimal: 0x12F591E940
• Base-36: 11EOYGQO

Squares and roots of 81429391680

• 81429391680 squared (81429391680²) is 6630745829374853222400
• 81429391680 cubed (81429391680³) is 539937599270691372589319749632000
• The square root of 81429391680 is 285358.3565974545
• The cube root of 81429391680 is 4334.3807956737

Scales and comparisons

• 81,429,391,680 seconds is equal to 2,589 years, 10 weeks, 3 days, 19 hours, 28 minutes.
• To count from 1 to 81,429,391,680 would take you about five thousand, one hundred seventy-eight 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 81429391680 cubic inches would be around 361.2 feet tall.

Recreational maths with 81429391680

• 81429391680 backwards is 08619392418
• The number of decimal digits it has is: 11
• The sum of 81429391680's digits is 51
• More coming soon!