81351208320

Names of 81351208320

• Cardinal: 81351208320 can be written as Eighty-one billion, three hundred fifty-one million, two hundred eight thousand, three hundred twenty.

Scientific notation

• Scientific notation: 8.135120832 × 10¹⁰

Factors of 81351208320

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 729

Divisors of 81351208320

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 29 30 32 40 48 58 60 64 80 83 87 96 116 120 128 145 160 166 174 192 232 240 249 290 320 332 348 384 415 435 464 480 498 580 607 640 664 696 830 841 870 928 960 996 1160 1214 1245 1328 1392 1660 1682 1740 1821 1856 1920 1992 2320 2407 2428 2490 2523 2656 2784 3035 3320 3364 3480 3642 3712 3984 4205 4640 4814 4856 4980 5046 5312 5568 6070 6640 6728 6960 7221 7284 7968 8410 9105 9280 9628 9712 9960 10092 10624 11136 12035 12140 12615 13280 13456 13920 14442 14568 15936 16820 17603 18210 18560 19256 19424 19920 20184 24070 24280 25230 26560 26912 27840 28884 29136 31872 33640 35206 36105 36420 38512 38848 39840 40368 48140 48560 50381 50460 52809 53120 53824 55680 57768 58272 67280 69803 70412 72210 72840 77024 77696 79680 80736 88015 96280 97120 100762 100920 105618 107648 115536 116544 134560 139606 140824 144420 145680 151143 154048 159360 161472 176030 192560 194240 201524 201840 209409 211236 231072 233088 251905 264045 269120 279212 281648 288840 291360 302286 308096 322944 349015 352060 385120 388480 403048 403680 418818 422472 462144 503810 510487 528090 538240 558424 563296 577680 582720 604572 698030 704120 755715 770240 806096 807360 837636 844944 924288 1007620 1020974 1047045 1056180 1116848 1126592 1155360 1165440 1209144 1396060 1408240 1461049 1511430 1531461 1540480 1612192 1614720 1675272 1689888 2015240 2041948 2094090 2112360 2233696 2253184 2310720 2418288 2552435 2792120 2816480 2922098 3022860 3062922 3224384 3350544 3379776 4030480 4083896 4188180 4224720 4383147 4467392 4621440 4836576 5104870 5584240 5632960 5844196 6045720 6125844 6448768 6701088 6759552 7305245 7657305 8060960 8167792 8376360 8449440 8766294 8934784 9673152 10209740 11168480 11265920 11688392 12091440 12251688 13402176 14610490 15314610 16121920 16335584 16752720 16898880 17532588 19346304 20419480 21915735 22336960 23376784 24182880 24503376 26804352 29220980 30629220 32243840 32671168 33505440 33797760 35065176 40838960 42370421 43831470 44673920 46753568 48365760 49006752 58441960 61258440 65342336 67010880 70130352 81677920 84740842 87662940 93507136 96731520 98013504 116883920 122516880 127111263 134021760 140260704 163355840 169481684 175325880 187014272 196027008 211852105 233767840 245033760 254222526 280521408 326711680 338963368 350651760 423704210 467535680 490067520 508445052 561042816 635556315 677926736 701303520 847408420 935071360 980135040 1016890104 1271112630 1355853472 1402607040 1694816840 2033780208 2542225260 2711706944 2805214080 3389633680 4067560416 5084450520 5423413888 6779267360 8135120832 10168901040 13558534720 16270241664 20337802080 27117069440 40675604160 81351208320
• Sum of all divisors σ(n): 272240317440
• Sum of proper divisors (its aliquot sum) s(n): 190889109120
• 81351208320 is an abundant number, because the sum of its proper divisors (190889109120) is greater than itself. Its abundance is 109537900800

Bases of 81351208320

• Binary: 1001011110000111010001110110110000000₂
• Hexadecimal: 0x12F0E8ED80
• Base-36: 11DEEQ2O

Squares and roots of 81351208320

• 81351208320 squared (81351208320²) is 6618019095124037222400
• 81351208320 cubed (81351208320³) is 538383850073173448318896570368000
• The square root of 81351208320 is 285221.3321615339
• The cube root of 81351208320 is 4332.9931518883

Scales and comparisons

• 81,351,208,320 seconds is equal to 2,586 years, 37 weeks, 1 day, 21 hours, 52 minutes.
• To count from 1 to 81,351,208,320 would take you about five thousand, one hundred seventy-three 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 81351208320 cubic inches would be around 361.1 feet tall.

Recreational maths with 81351208320

• 81351208320 backwards is 02380215318
• The number of decimal digits it has is: 11
• The sum of 81351208320's digits is 33
• More coming soon!