81385829013

Names of 81385829013

• Cardinal: 81385829013 can be written as Eighty-one billion, three hundred eighty-five million, eight hundred twenty-nine thousand and thirteen.

Scientific notation

• Scientific notation: 8.1385829013 × 10¹⁰

Factors of 81385829013

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 1390

Divisors of 81385829013

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 29 31 87 89 93 267 409 829 899 1227 2487 2581 2697 2759 7743 8277 11861 12679 24041 25699 35583 36401 38037 72123 73781 77097 80011 109203 221343 240033 339061 367691 745271 1017183 1055629 1103073 1128431 2139649 2235813 2287211 3166887 3385293 6418947 6861633 9832769 10510891 29498307 30176429 31532673 32724499 66329119 90529287 98173497 198987357 304815839 875116441 914447517 935469299 2625349323 2806407897 27128609671 81385829013
• Sum of all divisors σ(n): 117607680000
• Sum of proper divisors (its aliquot sum) s(n): 36221850987
• 81385829013 is a deficient number, because the sum of its proper divisors (36221850987) is less than itself. Its deficiency is 45163978026

Bases of 81385829013

• Binary: 1001011110010111110010011001010010101₂
• Hexadecimal: 0x12F2F93295
• Base-36: 11DZ0RKL

Squares and roots of 81385829013

• 81385829013 squared (81385829013²) is 6623653164133272554169
• 81385829013 cubed (81385829013³) is 539071503857566944437724014305197
• The square root of 81385829013 is 285282.0166309119
• The cube root of 81385829013 is 4333.6077297321

Scales and comparisons

• 81,385,829,013 seconds is equal to 2,587 years, 42 weeks, 3 days, 14 hours, 43 minutes, 33 seconds.
• To count from 1 to 81,385,829,013 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 81385829013 cubic inches would be around 361.1 feet tall.

Recreational maths with 81385829013

• 81385829013 backwards is 31092858318
• The number of decimal digits it has is: 11
• The sum of 81385829013's digits is 48
• More coming soon!