81390268988

Names of 81390268988

• Cardinal: 81390268988 can be written as Eighty-one billion, three hundred ninety million, two hundred sixty-eight thousand, nine hundred eighty-eight.

Scientific notation

• Scientific notation: 8.1390268988 × 10¹⁰

Factors of 81390268988

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 7678

Divisors of 81390268988

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 4 7 14 28 31 62 124 217 419 434 838 868 961 1676 1922 2933 3844 5866 6727 7219 11732 12989 13454 14438 25978 26908 28876 50533 51956 90923 101066 181846 202132 223789 363692 402659 447578 805318 895156 1566523 1610636 2818613 3024761 3133046 5637226 6049522 6266092 6937459 11274452 12099044 13874918 21173327 27749836 42346654 48562213 84693308 93767591 97124426 187535182 194248852 375070364 656373137 1312746274 2625492548 2906795321 5813590642 11627181284 20347567247 40695134494 81390268988
• Sum of all divisors σ(n): 168625699200
• Sum of proper divisors (its aliquot sum) s(n): 87235430212
• 81390268988 is an abundant number, because the sum of its proper divisors (87235430212) is greater than itself. Its abundance is 5845161224

Bases of 81390268988

• Binary: 1001011110011001111001111001000111100₂
• Hexadecimal: 0x12F33CF23C
• Base-36: 11E1NXH8

Squares and roots of 81390268988

• 81390268988 squared (81390268988²) is 6624375885938994544144
• 81390268988 cubed (81390268988³) is 539159735234195572906144600206272
• The square root of 81390268988 is 285289.7982543365
• The cube root of 81390268988 is 4333.6865344427

Scales and comparisons

• 81,390,268,988 seconds is equal to 2,587 years, 49 weeks, 6 days, 3 minutes, 8 seconds.
• To count from 1 to 81,390,268,988 would take you about five thousand, one hundred seventy-five 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 81390268988 cubic inches would be around 361.1 feet tall.

Recreational maths with 81390268988

• 81390268988 backwards is 88986209318
• 81390268988 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81390268988's digits is 62
• More coming soon!