81683980

Names of 81683980

• Cardinal: 81683980 can be written as Eighty-one million, six hundred eighty-three thousand, nine hundred eighty.

Scientific notation

• Scientific notation: 8.168398 × 10⁷

Factors of 81683980

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 4934

Divisors of 81683980

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 4 5 7 10 14 17 20 28 34 35 49 68 70 85 98 119 140 170 196 238 245 340 476 490 595 833 980 1190 1666 2380 3332 4165 4903 8330 9806 16660 19612 24515 34321 49030 68642 83351 98060 137284 166702 171605 240247 333404 343210 416755 480494 583457 686420 833510 960988 1166914 1201235 1667020 2333828 2402470 2917285 4084199 4804940 5834570 8168398 11669140 16336796 20420995 40841990 81683980
• Sum of all divisors σ(n): 211323168
• Sum of proper divisors (its aliquot sum) s(n): 129639188
• 81683980 is an abundant number, because the sum of its proper divisors (129639188) is greater than itself. Its abundance is 47955208

Bases of 81683980

• Binary: 100110111100110011000001100₂
• Hexadecimal: 0x4DE660C
• Base-36: 1CMRRG

Squares and roots of 81683980

• 81683980 squared (81683980²) is 6672272588640400
• 81683980 cubed (81683980³) is 545017780685050660792000
• The square root of 81683980 is 9037.9190082673
• The cube root of 81683980 is 433.8893231481

Scales and comparisons

• 81,683,980 seconds is equal to 2 years, 31 weeks, 9 hours, 59 minutes, 40 seconds.
• To count from 1 to 81,683,980 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 81683980 cubic inches would be around 36.2 feet tall.

Recreational maths with 81683980

• 81683980 backwards is 08938618
• The number of decimal digits it has is: 8
• The sum of 81683980's digits is 43
• More coming soon!