81818389872

Names of 81818389872

• Cardinal: 81818389872 can be written as Eighty-one billion, eight hundred eighteen million, three hundred eighty-nine thousand, eight hundred seventy-two.

Scientific notation

• Scientific notation: 8.1818389872 × 10¹⁰

Factors of 81818389872

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 961595

Divisors of 81818389872

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 36 48 54 72 108 144 197 216 394 432 591 788 1182 1576 1773 2364 3152 3546 4728 5319 7092 9456 10638 14184 21276 28368 42552 85104 961393 1922786 2884179 3845572 5768358 7691144 8652537 11536716 15382288 17305074 23073432 25957611 34610148 46146864 51915222 69220296 103830444 138440592 189394421 207660888 378788842 415321776 568183263 757577684 1136366526 1515155368 1704549789 2272733052 3030310736 3409099578 4545466104 5113649367 6818199156 9090932208 10227298734 13636398312 20454597468 27272796624 40909194936 81818389872
• Sum of all divisors σ(n): 236041454880
• Sum of proper divisors (its aliquot sum) s(n): 154223065008
• 81818389872 is an abundant number, because the sum of its proper divisors (154223065008) is greater than itself. Its abundance is 72404675136

Bases of 81818389872

• Binary: 1001100001100110000011000110101110000₂
• Hexadecimal: 0x130CC18D70
• Base-36: 11L4K1O0

Squares and roots of 81818389872

• 81818389872 squared (81818389872²) is 6694248921246592176384
• 81818389872 cubed (81818389872³) is 547712668138769102938771103182848
• The square root of 81818389872 is 286039.1404545889
• The cube root of 81818389872 is 4341.2717904877

Scales and comparisons

• 81,818,389,872 seconds is equal to 2,601 years, 29 weeks, 5 days, 2 hours, 31 minutes, 12 seconds.
• To count from 1 to 81,818,389,872 would take you about five thousand, two hundred 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 81818389872 cubic inches would be around 361.8 feet tall.

Recreational maths with 81818389872

• 81818389872 backwards is 27898381818
• The number of decimal digits it has is: 11
• The sum of 81818389872's digits is 63
• More coming soon!