81315072768

Names of 81315072768

• Cardinal: 81315072768 can be written as Eighty-one billion, three hundred fifteen million, seventy-two thousand, seven hundred sixty-eight.

Scientific notation

• Scientific notation: 8.1315072768 × 10¹⁰

Factors of 81315072768

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 105220

Divisors of 81315072768

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 6 8 12 16 19 24 32 38 48 53 57 64 76 96 106 114 128 152 159 192 212 228 256 304 318 384 424 456 608 636 768 848 912 1007 1216 1272 1696 1824 2014 2432 2544 3021 3392 3648 4028 4864 5088 6042 6784 7296 8056 10176 12084 13568 14592 16112 20352 24168 32224 40704 48336 64448 96672 105143 128896 193344 210286 257792 315429 386688 420572 630858 773376 841144 1261716 1682288 1997717 2523432 3364576 3995434 5046864 5572579 5993151 6729152 7990868 10093728 11145158 11986302 13458304 15981736 16717737 20187456 22290316 23972604 26916608 31963472 33435474 40374912 44580632 47945208 63926944 66870948 80749824 89161264 95890416 105879001 127853888 133741896 178322528 191780832 211758002 255707776 267483792 317637003 356645056 383561664 423516004 511415552 534967584 635274006 713290112 767123328 847032008 1069935168 1270548012 1426580224 1534246656 1694064016 2139870336 2541096024 3388128032 4279740672 5082192048 6776256064 10164384096 13552512128 20328768192 27105024256 40657536384 81315072768
• Sum of all divisors σ(n): 232107482880
• Sum of proper divisors (its aliquot sum) s(n): 150792410112
• 81315072768 is an abundant number, because the sum of its proper divisors (150792410112) is greater than itself. Its abundance is 69477337344

Bases of 81315072768

• Binary: 1001011101110110000011000101100000000₂
• Hexadecimal: 0x12EEC18B00
• Base-36: 11CSW7PC

Squares and roots of 81315072768

• 81315072768 squared (81315072768²) is 6612141059265135181824
• 81315072768 cubed (81315072768³) is 537666731386425067915375470968832
• The square root of 81315072768 is 285157.9786153633
• The cube root of 81315072768 is 4332.3514966445

Scales and comparisons

• 81,315,072,768 seconds is equal to 2,585 years, 29 weeks, 3 days, 16 hours, 12 minutes, 48 seconds.
• To count from 1 to 81,315,072,768 would take you about five thousand, one hundred seventy-one 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 81315072768 cubic inches would be around 361 feet tall.

Recreational maths with 81315072768

• 81315072768 backwards is 86727051318
• 81315072768 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81315072768's digits is 48
• More coming soon!