81357243840

Names of 81357243840

• Cardinal: 81357243840 can be written as Eighty-one billion, three hundred fifty-seven million, two hundred forty-three thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.135724384 × 10¹⁰

Factors of 81357243840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 11374

Divisors of 81357243840

• Number of divisors d(n): 168
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 64 72 80 90 96 120 144 160 180 192 240 288 320 360 480 576 720 960 1440 2880 3673 7346 7691 11019 14692 15382 18365 22038 23073 29384 30764 33057 36730 38455 44076 46146 55095 58768 61528 66114 69219 73460 76910 88152 92292 110190 115365 117536 123056 132228 138438 146920 153820 165285 176304 184584 220380 230730 235072 246112 264456 276876 293840 307640 330570 346095 352608 369168 440760 461460 492224 528912 553752 587680 615280 661140 692190 705216 738336 881520 922920 1057824 1107504 1175360 1230560 1322280 1384380 1476672 1763040 1845840 2115648 2215008 2461120 2644560 2768760 3526080 3691680 4430016 5289120 5537520 7383360 10578240 11075040 22150080 28249043 56498086 84747129 112996172 141245215 169494258 225992344 254241387 282490430 338988516 423735645 451984688 508482774 564980860 677977032 847471290 903969376 1016965548 1129961720 1271206935 1355954064 1694942580 1807938752 2033931096 2259923440 2542413870 2711908128 3389885160 4067862192 4519846880 5084827740 5423816256 6779770320 8135724384 9039693760 10169655480 13559540640 16271448768 20339310960 27119081280 40678621920 81357243840
• Sum of all divisors σ(n): 279947601648
• Sum of proper divisors (its aliquot sum) s(n): 198590357808
• 81357243840 is an abundant number, because the sum of its proper divisors (198590357808) is greater than itself. Its abundance is 117233113968

Bases of 81357243840

• Binary: 1001011110001010001010000010111000000₂
• Hexadecimal: 0x12F14505C0
• Base-36: 11DI0340

Squares and roots of 81357243840

• 81357243840 squared (81357243840²) is 6619001125241217945600
• 81357243840 cubed (81357243840³) is 538503688523484147218763055104000
• The square root of 81357243840 is 285231.9123800841
• The cube root of 81357243840 is 4333.1003054703

Scales and comparisons

• 81,357,243,840 seconds is equal to 2,586 years, 47 weeks, 1 day, 18 hours, 24 minutes.
• To count from 1 to 81,357,243,840 would take you about five thousand, one hundred seventy-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 81357243840 cubic inches would be around 361.1 feet tall.

Recreational maths with 81357243840

• 81357243840 backwards is 04834275318
• 81357243840 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81357243840's digits is 45
• More coming soon!