81638779040

Names of 81638779040

• Cardinal: 81638779040 can be written as Eighty-one billion, six hundred thirty-eight million, seven hundred seventy-nine thousand and forty.

Scientific notation

• Scientific notation: 8.163877904 × 10¹⁰

Factors of 81638779040

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 5512

Divisors of 81638779040

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 4 5 7 8 10 13 14 16 17 20 26 28 32 34 35 40 52 56 61 65 68 70 80 85 91 104 112 119 122 130 136 140 160 170 182 208 221 224 238 244 260 272 280 305 340 364 416 427 442 455 476 488 520 544 560 595 610 680 728 793 854 884 910 952 976 1037 1040 1105 1120 1190 1220 1360 1456 1547 1586 1708 1768 1820 1904 1952 2074 2080 2135 2210 2380 2440 2720 2912 3094 3172 3416 3536 3640 3808 3965 4148 4270 4420 4760 4880 5185 5407 5551 6188 6344 6832 7072 7259 7280 7735 7930 8296 8540 8840 9520 9760 10370 10814 11102 12376 12688 13481 13664 14518 14560 15470 15860 16592 17080 17680 19040 20740 21628 22204 24752 25376 26962 27035 27755 29036 30940 31720 33184 34160 35360 36295 37849 41480 43256 44408 49504 53924 54070 55510 58072 61880 63440 67405 68320 70291 72590 75698 82960 86512 88816 91919 94367 107848 108140 111020 116144 123760 126880 134810 140582 145180 151396 165920 173024 177632 183838 188734 189245 215696 216280 222040 232288 247520 269620 281164 290360 302792 329827 351455 367676 377468 378490 431392 432560 444080 459595 471835 492037 539240 562328 580720 605584 643433 659654 702910 735352 754936 756980 865120 888160 919190 943670 984074 1078480 1124656 1161440 1194947 1211168 1286866 1319308 1405820 1470704 1509872 1513960 1649135 1838380 1887340 1968148 2156960 2249312 2308789 2389894 2460185 2573732 2638616 2811640 2941408 3019744 3027920 3217165 3298270 3676760 3774680 3936296 4287751 4617578 4779788 4920370 5147464 5277232 5607059 5623280 5974735 6055840 6434330 6596540 7353520 7549360 7872592 8364629 8575502 9235156 9559576 9840740 10294928 10554464 11214118 11246560 11543945 11949470 12868660 13193080 14707040 15098720 15745184 16729258 17151004 18470312 19119152 19681480 20589856 21438755 22428236 23087890 23898940 25737320 26386160 28035295 30014257 33458516 34302008 36940624 38238304 39249413 39362960 41823145 42877510 44856472 46175780 47797880 51474640 52772320 56070590 60028514 66917032 68604016 72891767 73881248 78498826 78725920 83646290 85755020 89712944 92351560 95595760 102949280 112141180 120057028 133834064 137208032 145783534 150071285 156997652 167292580 171510040 179425888 184703120 191191520 196247065 224282360 240114056 267668128 291567068 300142570 313995304 334585160 343020080 364458835 369406240 392494130 448564720 480228112 510242369 583134136 600285140 627990608 669170320 686040160 728917670 784988260 897129440 960456224 1020484738 1166268272 1200570280 1255981216 1338340640 1457835340 1569976520 2040969476 2332536544 2401140560 2551211845 2915670680 3139953040 4081938952 4802281120 5102423690 5831341360 6279906080 8163877904 10204847380 11662682720 16327755808 20409694760 40819389520 81638779040
• Sum of all divisors σ(n): 255511646208
• Sum of proper divisors (its aliquot sum) s(n): 173872867168
• 81638779040 is an abundant number, because the sum of its proper divisors (173872867168) is greater than itself. Its abundance is 92234088128

Bases of 81638779040

• Binary: 1001100000010000011001110100010100000₂
• Hexadecimal: 0x13020CE8A0
• Base-36: 11I5MD28

Squares and roots of 81638779040

• 81638779040 squared (81638779040²) is 6664890243141943321600
• 81638779040 cubed (81638779040³) is 544113501885716986188306059264000
• The square root of 81638779040 is 285725.0059760259
• The cube root of 81638779040 is 4338.0927549533

Scales and comparisons

• 81,638,779,040 seconds is equal to 2,595 years, 44 weeks, 5 days, 6 hours, 37 minutes, 20 seconds.
• To count from 1 to 81,638,779,040 would take you about five thousand, one hundred ninety-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 81638779040 cubic inches would be around 361.5 feet tall.

Recreational maths with 81638779040

• 81638779040 backwards is 04097783618
• The number of decimal digits it has is: 11
• The sum of 81638779040's digits is 53
• More coming soon!