81971237320

Names of 81971237320

• Cardinal: 81971237320 can be written as Eighty-one billion, nine hundred seventy-one million, two hundred thirty-seven thousand, three hundred twenty.

Scientific notation

• Scientific notation: 8.197123732 × 10¹⁰

Factors of 81971237320

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 553448

Divisors of 81971237320

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 7 8 10 14 20 23 28 35 40 46 56 70 92 115 140 161 184 230 280 322 460 529 644 805 920 1058 1288 1610 2116 2645 3220 3703 4232 5290 6440 7406 10580 14812 18515 21160 29624 37030 74060 148120 553411 1106822 2213644 2767055 3873877 4427288 5534110 7747754 11068220 12728453 15495508 19369385 22136440 25456906 30991016 38738770 50913812 63642265 77477540 89099171 101827624 127284530 154955080 178198342 254569060 292754419 356396684 445495855 509138120 585508838 712793368 890991710 1171017676 1463772095 1781983420 2049280933 2342035352 2927544190 3563966840 4098561866 5855088380 8197123732 10246404665 11710176760 16394247464 20492809330 40985618660 81971237320
• Sum of all divisors σ(n): 220346521920
• Sum of proper divisors (its aliquot sum) s(n): 138375284600
• 81971237320 is an abundant number, because the sum of its proper divisors (138375284600) is greater than itself. Its abundance is 56404047280

Bases of 81971237320

• Binary: 1001100010101110111011101000111001000₂
• Hexadecimal: 0x1315DDD1C8
• Base-36: 11NNK3IG

Squares and roots of 81971237320

• 81971237320 squared (81971237320²) is 6719283747771760782400
• 81971237320 cubed (81971237320³) is 550788002709018024288379279168000
• The square root of 81971237320 is 286306.1950429993
• The cube root of 81971237320 is 4343.9734632321

Scales and comparisons

• 81,971,237,320 seconds is equal to 2,606 years, 22 weeks, 3 days, 4 hours, 8 minutes, 40 seconds.
• To count from 1 to 81,971,237,320 would take you about five thousand, two hundred twelve 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 81971237320 cubic inches would be around 362 feet tall.

Recreational maths with 81971237320

• 81971237320 backwards is 02373217918
• The number of decimal digits it has is: 11
• The sum of 81971237320's digits is 43
• More coming soon!