81405821440

Names of 81405821440

• Cardinal: 81405821440 can be written as Eighty-one billion, four hundred five million, eight hundred twenty-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.140582144 × 10¹⁰

Factors of 81405821440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 403

Divisors of 81405821440

• Number of divisors d(n): 320
• Complete list of divisors:
  1 2 4 5 8 10 16 20 31 32 40 41 62 64 80 82 124 127 128 155 160 164 197 205 248 254 256 310 320 328 394 410 496 508 512 620 635 640 656 788 820 985 992 1016 1240 1270 1271 1280 1312 1576 1640 1970 1984 2032 2480 2540 2542 2560 2624 3152 3280 3937 3940 3968 4064 4960 5080 5084 5207 5248 6107 6304 6355 6560 7874 7880 7936 8077 8128 9920 10160 10168 10414 10496 12214 12608 12710 13120 15748 15760 15872 16154 16256 19685 19840 20320 20336 20828 20992 24428 25019 25216 25420 26035 26240 30535 31496 31520 32308 32512 39370 39680 40385 40640 40672 41656 48856 50038 50432 50840 52070 52480 61070 62992 63040 64616 65024 78740 79360 80770 81280 81344 83312 97712 100076 100864 101680 104140 104960 122140 125095 125984 126080 129232 157480 161417 161540 162560 162688 166624 195424 200152 203360 208280 244280 250190 250387 251968 252160 258464 314960 322834 323080 325120 325376 333248 390848 400304 406720 416560 488560 500380 500774 503936 504320 516928 629920 645668 646160 650752 666496 775589 781696 800608 807085 813440 833120 977120 1000760 1001548 1007872 1025779 1033856 1251935 1259840 1291336 1292320 1332992 1551178 1563392 1601216 1614170 1626880 1666240 1954240 2001520 2003096 2015744 2051558 2067712 2503870 2519680 2582672 2584640 2665984 3102356 3126784 3202432 3228340 3253760 3332480 3877945 3908480 4003040 4006192 4103116 4135424 5007740 5039360 5128895 5165344 5169280 6204712 6404864 6456680 6664960 7755890 7816960 8006080 8012384 8206232 10015480 10078720 10257790 10330688 10338560 12409424 12809728 12913360 13329920 15511780 15633920 16012160 16024768 16412464 20030960 20515580 20661376 20677120 24818848 25826720 31023560 31799149 32024320 32049536 32824928 40061920 41031160 41322752 49637696 51653440 62047120 63598298 64048640 64099072 65649856 80123840 82062320 82645504 99275392 103306880 124094240 127196596 128198144 131299712 158995745 160247680 164124640 198550784 206613760 248188480 254393192 262599424 317991490 320495360 328249280 397101568 413227520 496376960 508786384 525198848 635982980 640990720 656498560 992753920 1017572768 1271965960 1312997120 1985507840 2035145536 2543931920 2625994240 4070291072 5087863840 8140582144 10175727680 16281164288 20351455360 40702910720 81405821440
• Sum of all divisors σ(n): 209074618368
• Sum of proper divisors (its aliquot sum) s(n): 127668796928
• 81405821440 is an abundant number, because the sum of its proper divisors (127668796928) is greater than itself. Its abundance is 46262975488

Bases of 81405821440

• Binary: 1001011110100001010100100001000000000₂
• Hexadecimal: 0x12F42A4200
• Base-36: 11EAX9TS

Squares and roots of 81405821440

• 81405821440 squared (81405821440²) is 6626907764321163673600
• 81405821440 cubed (81405821440³) is 539468870161678252826096041984000
• The square root of 81405821440 is 285317.0542396651
• The cube root of 81405821440 is 4333.9625508923

Scales and comparisons

• 81,405,821,440 seconds is equal to 2,588 years, 23 weeks, 4 days, 10 minutes, 40 seconds.
• To count from 1 to 81,405,821,440 would take you about five thousand, one hundred seventy-six 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 81405821440 cubic inches would be around 361.2 feet tall.

Recreational maths with 81405821440

• 81405821440 backwards is 04412850418
• The number of decimal digits it has is: 11
• The sum of 81405821440's digits is 37
• More coming soon!