81438726240

Names of 81438726240

• Cardinal: 81438726240 can be written as Eighty-one billion, four hundred thirty-eight million, seven hundred twenty-six thousand, two hundred forty.

Scientific notation

• Scientific notation: 8.143872624 × 10¹⁰

Factors of 81438726240

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 18851567

Divisors of 81438726240

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 72 80 90 96 108 120 135 144 160 180 216 240 270 288 360 432 480 540 720 864 1080 1440 2160 4320 18851557 37703114 56554671 75406228 94257785 113109342 150812456 169664013 188515570 226218684 282773355 301624912 339328026 377031140 452437368 508992039 565546710 603249824 678656052 754062280 848320065 904874736 1017984078 1131093420 1357312104 1508124560 1696640130 1809749472 2035968156 2262186840 2544960195 2714624208 3016249120 3393280260 4071936312 4524373680 5089920390 5429248416 6786560520 8143872624 9048747360 10179840780 13573121040 16287745248 20359681560 27146242080 40719363120 81438726240
• Sum of all divisors σ(n): 285035556960
• Sum of proper divisors (its aliquot sum) s(n): 203596830720
• 81438726240 is an abundant number, because the sum of its proper divisors (203596830720) is greater than itself. Its abundance is 122158104480

Bases of 81438726240

• Binary: 1001011110110001000000101100001100000₂
• Hexadecimal: 0x12F6205860
• Base-36: 11EUIJC0

Squares and roots of 81438726240

• 81438726240 squared (81438726240²) is 6632266131593664537600
• 81438726240 cubed (81438726240³) is 540123305841680261196002586624000
• The square root of 81438726240 is 285374.7119840859
• The cube root of 81438726240 is 4334.5464115153

Scales and comparisons

• 81,438,726,240 seconds is equal to 2,589 years, 25 weeks, 6 days, 20 hours, 24 minutes.
• To count from 1 to 81,438,726,240 would take you about five thousand, one hundred seventy-eight 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 81438726240 cubic inches would be around 361.2 feet tall.

Recreational maths with 81438726240

• 81438726240 backwards is 04262783418
• 81438726240 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81438726240's digits is 45
• More coming soon!