81037491390

Names of 81037491390

• Cardinal: 81037491390 can be written as Eighty-one billion, thirty-seven million, four hundred ninety-one thousand, three hundred ninety.

Scientific notation

• Scientific notation: 8.103749139 × 10¹⁰

Factors of 81037491390

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 26777

Divisors of 81037491390

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 9 10 15 18 27 30 37 45 54 74 90 111 135 185 222 270 307 333 370 555 614 666 921 999 1110 1535 1665 1842 1998 2763 3070 3330 4605 4995 5526 8289 9210 9990 11359 13815 16578 22718 26423 27630 34077 41445 52846 56795 68154 79269 82890 102231 113590 132115 158538 170385 204462 237807 264230 306693 340770 396345 475614 511155 613386 713421 792690 977651 1022310 1189035 1426842 1533465 1955302 2378070 2932953 3066930 3567105 4888255 5865906 7134210 8111861 8798859 9776510 14664765 16223722 17597718 24335583 26396577 29329530 40559305 43994295 48671166 52793154 73006749 81118610 87988590 121677915 131982885 146013498 219020247 243355830 263965770 300138857 365033745 438040494 600277714 730067490 900416571 1095101235 1500694285 1800833142 2190202470 2701249713 3001388570 4502082855 5402499426 8103749139 9004165710 13506248565 16207498278 27012497130 40518745695 81037491390
• Sum of all divisors σ(n): 222671877120
• Sum of proper divisors (its aliquot sum) s(n): 141634385730
• 81037491390 is an abundant number, because the sum of its proper divisors (141634385730) is greater than itself. Its abundance is 60596894340

Bases of 81037491390

• Binary: 1001011011110001101011111110010111110₂
• Hexadecimal: 0x12DE35FCBE
• Base-36: 1187MOJI

Squares and roots of 81037491390

• 81037491390 squared (81037491390²) is 6567075010784324132100
• 81037491390 cubed (81037491390³) is 532179284643918824002022972619000
• The square root of 81037491390 is 284670.8474536865
• The cube root of 81037491390 is 4327.4161627831

Scales and comparisons

• 81,037,491,390 seconds is equal to 2,576 years, 38 weeks, 3 days, 22 hours, 16 minutes, 30 seconds.
• To count from 1 to 81,037,491,390 would take you about five thousand, one hundred fifty-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 81037491390 cubic inches would be around 360.6 feet tall.

Recreational maths with 81037491390

• 81037491390 backwards is 09319473018
• 81037491390 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81037491390's digits is 45
• More coming soon!