81364920

Names of 81364920

• Cardinal: 81364920 can be written as Eighty-one million, three hundred sixty-four thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 8.136492 × 10⁷

Factors of 81364920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 7481

Divisors of 81364920

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 13 14 15 20 21 24 26 28 30 35 39 40 42 52 56 60 65 70 78 84 91 104 105 120 130 140 156 168 182 195 210 260 273 280 312 364 390 420 455 520 546 728 780 840 910 1092 1365 1560 1820 2184 2730 3640 5460 7451 10920 14902 22353 29804 37255 44706 52157 59608 74510 89412 96863 104314 111765 149020 156471 178824 193726 208628 223530 260785 290589 298040 312942 387452 417256 447060 484315 521570 581178 625884 678041 774904 782355 894120 968630 1043140 1162356 1251768 1356082 1452945 1564710 1937260 2034123 2086280 2324712 2712164 2905890 3129420 3390205 3874520 4068246 5424328 5811780 6258840 6780410 8136492 10170615 11623560 13560820 16272984 20341230 27121640 40682460 81364920
• Sum of all divisors σ(n): 300464640
• Sum of proper divisors (its aliquot sum) s(n): 219099720
• 81364920 is an abundant number, because the sum of its proper divisors (219099720) is greater than itself. Its abundance is 137734800

Bases of 81364920

• Binary: 100110110011000011110111000₂
• Hexadecimal: 0x4D987B8
• Base-36: 1CFXKO

Squares and roots of 81364920

• 81364920 squared (81364920²) is 6620250206606400
• 81364920 cubed (81364920³) is 538656128440513207488000
• The square root of 81364920 is 9020.2505508439
• The cube root of 81364920 is 433.3236579035

Scales and comparisons

• 81,364,920 seconds is equal to 2 years, 30 weeks, 3 days, 17 hours, 22 minutes.
• To count from 1 to 81,364,920 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 81364920 cubic inches would be around 36.1 feet tall.

Recreational maths with 81364920

• 81364920 backwards is 02946318
• The number of decimal digits it has is: 8
• The sum of 81364920's digits is 33
• More coming soon!