81998196720

Names of 81998196720

• Cardinal: 81998196720 can be written as Eighty-one billion, nine hundred ninety-eight million, one hundred ninety-six thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.199819672 × 10¹⁰

Factors of 81998196720

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1001985

Divisors of 81998196720

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 31 33 40 44 48 55 60 62 66 80 88 93 110 120 124 132 155 165 176 186 220 240 248 264 310 330 341 372 440 465 496 528 620 660 682 744 880 930 1023 1240 1320 1364 1488 1705 1860 2046 2480 2640 2728 3410 3720 4092 5115 5456 6820 7440 8184 10230 13640 16368 20460 27280 40920 81840 1001933 2003866 3005799 4007732 5009665 6011598 8015464 10019330 11021263 12023196 15028995 16030928 20038660 22042526 24046392 30057990 31059923 33063789 40077320 44085052 48092784 55106315 60115980 62119846 66127578 80154640 88170104 93179769 110212630 120231960 124239692 132255156 155299615 165318945 176340208 186359538 220425260 240463920 248479384 264510312 310599230 330637890 341659153 372719076 440850520 465898845 496958768 529020624 621198460 661275780 683318306 745438152 881701040 931797690 1024977459 1242396920 1322551560 1366636612 1490876304 1708295765 1863595380 2049954918 2484793840 2645103120 2733273224 3416591530 3727190760 4099909836 5124887295 5466546448 6833183060 7454381520 8199819672 10249774590 13666366120 16399639344 20499549180 27332732240 40999098360 81998196720
• Sum of all divisors σ(n): 286248536064
• Sum of proper divisors (its aliquot sum) s(n): 204250339344
• 81998196720 is an abundant number, because the sum of its proper divisors (204250339344) is greater than itself. Its abundance is 122252142624

Bases of 81998196720

• Binary: 1001100010111011110010010111111110000₂
• Hexadecimal: 0x1317792FF0
• Base-36: 11O3LXIO

Squares and roots of 81998196720

• 81998196720 squared (81998196720²) is 6723704265331818758400
• 81998196720 cubed (81998196720³) is 551331625035781550626669352448000
• The square root of 81998196720 is 286353.2725847567
• The cube root of 81998196720 is 4344.4496387199

Scales and comparisons

• 81,998,196,720 seconds is equal to 2,607 years, 15 weeks, 4 hours, 52 minutes.
• To count from 1 to 81,998,196,720 would take you about five thousand, two hundred fourteen 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 81998196720 cubic inches would be around 362 feet tall.

Recreational maths with 81998196720

• 81998196720 backwards is 02769189918
• 81998196720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81998196720's digits is 60
• More coming soon!