81121920

Names of 81121920

• Cardinal: 81121920 can be written as Eighty-one million, one hundred twenty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 8.112192 × 10⁷

Factors of 81121920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 211

Divisors of 81121920

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 23 24 30 32 33 40 44 46 48 55 60 64 66 69 80 88 92 96 110 115 120 128 132 138 160 165 167 176 184 192 220 230 240 253 264 276 320 330 334 345 352 368 384 440 460 480 501 506 528 552 640 660 668 690 704 736 759 835 880 920 960 1002 1012 1056 1104 1265 1320 1336 1380 1408 1472 1518 1670 1760 1837 1840 1920 2004 2024 2112 2208 2505 2530 2640 2672 2760 2944 3036 3340 3520 3674 3680 3795 3841 4008 4048 4224 4416 5010 5060 5280 5344 5511 5520 6072 6680 7040 7348 7360 7590 7682 8016 8096 8832 9185 10020 10120 10560 10688 11022 11040 11523 12144 13360 14696 14720 15180 15364 16032 16192 18370 19205 20040 20240 21120 21376 22044 22080 23046 24288 26720 27555 29392 30360 30728 32064 32384 36740 38410 40080 40480 42251 44088 44160 46092 48576 53440 55110 57615 58784 60720 61456 64128 73480 76820 80160 80960 84502 88176 92184 97152 106880 110220 115230 117568 121440 122912 126753 146960 153640 160320 161920 169004 176352 184368 211255 220440 230460 235136 242880 245824 253506 293920 307280 320640 338008 352704 368736 422510 440880 460920 485760 491648 507012 587840 614560 633765 676016 705408 737472 845020 881760 921840 1014024 1175680 1229120 1267530 1352032 1474944 1690040 1763520 1843680 2028048 2458240 2535060 2704064 3380080 3527040 3687360 4056096 5070120 5408128 6760160 7374720 8112192 10140240 13520320 16224384 20280480 27040640 40560960 81121920
• Sum of all divisors σ(n): 296110080
• Sum of proper divisors (its aliquot sum) s(n): 214988160
• 81121920 is an abundant number, because the sum of its proper divisors (214988160) is greater than itself. Its abundance is 133866240

Bases of 81121920

• Binary: 100110101011101001010000000₂
• Hexadecimal: 0x4D5D280
• Base-36: 1CAQ2O

Squares and roots of 81121920

• 81121920 squared (81121920²) is 6580765904486400
• 81121920 cubed (81121920³) is 533844365242473381888000
• The square root of 81121920 is 9006.7707864695
• The cube root of 81121920 is 432.8918475341

Scales and comparisons

• 81,121,920 seconds is equal to 2 years, 30 weeks, 21 hours, 52 minutes.
• To count from 1 to 81,121,920 would take you about 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 81121920 cubic inches would be around 36.1 feet tall.

Recreational maths with 81121920

• 81121920 backwards is 02912118
• 81121920 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81121920's digits is 24
• More coming soon!