81216928320

Names of 81216928320

• Cardinal: 81216928320 can be written as Eighty-one billion, two hundred sixteen million, nine hundred twenty-eight thousand, three hundred twenty.

Scientific notation

• Scientific notation: 8.121692832 × 10¹⁰

Factors of 81216928320

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 880

Divisors of 81216928320

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 32 33 40 44 48 55 60 64 66 67 80 88 96 110 120 132 134 160 165 176 191 192 201 220 240 264 268 320 330 335 352 382 402 440 480 528 536 573 601 660 670 704 737 764 804 880 955 960 1005 1056 1072 1146 1202 1320 1340 1474 1528 1608 1760 1803 1910 2010 2101 2112 2144 2211 2292 2404 2640 2680 2865 2948 3005 3056 3216 3520 3606 3685 3820 4020 4202 4288 4422 4584 4808 5280 5360 5730 5896 6010 6112 6303 6432 6611 7212 7370 7640 8040 8404 8844 9015 9168 9616 10505 10560 10720 11055 11460 11792 12020 12224 12606 12797 12864 13222 14424 14740 15280 16080 16808 17688 18030 18336 19232 19833 21010 21440 22110 22920 23584 24040 25212 25594 26444 28848 29480 30560 31515 32160 33055 33616 35376 36060 36672 38391 38464 39666 40267 42020 44220 45840 47168 48080 50424 51188 52888 57696 58960 61120 63030 63985 64320 66110 67232 70752 72120 76782 79332 80534 84040 88440 91680 96160 99165 100848 102376 105776 114791 115392 117920 120801 126060 127970 132220 134464 140767 141504 144240 153564 158664 161068 168080 176880 183360 191955 192320 198330 201335 201696 204752 211552 229582 235840 241602 252120 255940 264440 281534 288480 307128 317328 322136 336160 344373 353760 383910 396660 402670 403392 409504 422301 423104 442937 459164 483204 504240 511880 528880 563068 573955 576960 604005 614256 634656 644272 672320 688746 703835 707520 767820 793320 805340 819008 844602 885874 918328 966408 1008480 1023760 1057760 1126136 1147910 1208010 1228512 1262701 1269312 1288544 1328811 1377492 1407670 1535640 1586640 1610680 1689204 1721865 1771748 1836656 1932816 2016960 2047520 2111505 2115520 2214685 2252272 2295820 2416020 2457024 2525402 2577088 2657622 2754984 2815340 3071280 3173280 3221360 3378408 3443730 3543496 3673312 3788103 3865632 4095040 4223010 4429370 4504544 4591640 4832040 5050804 5315244 5509968 5630680 6142560 6313505 6346560 6442720 6644055 6756816 6887460 7086992 7346624 7576206 7690997 7731264 8446020 8858740 9009088 9183280 9664080 10101608 10630488 11019936 11261360 12285120 12627010 12885440 13288110 13513632 13774920 14173984 15152412 15381994 16892040 17717480 18366560 18940515 19328160 20203216 21260976 22039872 22522720 23072991 25254020 26576220 27027264 27549840 28347968 30304824 30763988 33784080 35434960 36733120 37881030 38454985 38656320 40406432 42521952 45045440 46145982 50508040 53152440 55099680 60609648 61527976 67568160 70869920 75762060 76909970 80812864 84600967 85043904 92291964 101016080 106304880 110199360 115364955 121219296 123055952 135136320 141739840 151524120 153819940 169201934 184583928 202032160 212609760 230729910 242438592 246111904 253802901 303048240 307639880 338403868 369167856 404064320 423004835 425219520 461459820 492223808 507605802 606096480 615279760 676807736 738335712 846009670 922919640 1015211604 1212192960 1230559520 1269014505 1353615472 1476671424 1692019340 1845839280 2030423208 2461119040 2538029010 2707230944 3384038680 3691678560 4060846416 5076058020 5414461888 6768077360 7383357120 8121692832 10152116040 13536154720 16243385664 20304232080 27072309440 40608464160 81216928320
• Sum of all divisors σ(n): 287476826112
• Sum of proper divisors (its aliquot sum) s(n): 206259897792
• 81216928320 is an abundant number, because the sum of its proper divisors (206259897792) is greater than itself. Its abundance is 125042969472

Bases of 81216928320

• Binary: 1001011101000111001111111101001000000₂
• Hexadecimal: 0x12E8E7FA40
• Base-36: 11B6GMYO

Squares and roots of 81216928320

• 81216928320 squared (81216928320²) is 6596189445736018022400
• 81216928320 cubed (81216928320³) is 535722245399482705367488954368000
• The square root of 81216928320 is 284985.8388060713
• The cube root of 81216928320 is 4330.6077960317

Scales and comparisons

• 81,216,928,320 seconds is equal to 2,582 years, 23 weeks, 1 day, 17 hours, 52 minutes.
• To count from 1 to 81,216,928,320 would take you about five thousand, one hundred sixty-four 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 81216928320 cubic inches would be around 360.9 feet tall.

Recreational maths with 81216928320

• 81216928320 backwards is 02382961218
• The number of decimal digits it has is: 11
• The sum of 81216928320's digits is 42
• More coming soon!