81438165315

Names of 81438165315

• Cardinal: 81438165315 can be written as Eighty-one billion, four hundred thirty-eight million, one hundred sixty-five thousand, three hundred fifteen.

Scientific notation

• Scientific notation: 8.1438165315 × 10¹⁰

Factors of 81438165315

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 280

Divisors of 81438165315

• Number of divisors d(n): 256
• Complete list of divisors:
  1 3 5 9 13 15 27 37 39 41 45 65 111 117 123 135 169 181 185 195 205 333 351 369 481 507 533 543 555 585 615 845 905 999 1107 1443 1517 1521 1599 1629 1665 1755 1845 2197 2353 2405 2535 2665 2715 4329 4551 4563 4797 4887 4995 5535 6253 6591 6697 6929 7059 7215 7421 7585 7605 7995 8145 10985 11765 12987 13653 14391 18759 19721 19773 20091 20787 21177 21645 22263 22755 22815 23985 24435 30589 31265 32955 33485 34645 35295 37105 40959 56277 59163 59319 60273 62361 63531 64935 66789 68265 71955 81289 87061 90077 91767 93795 96473 98605 98865 100455 103935 105885 111315 152945 168831 177489 180819 187083 200367 204795 243867 256373 261183 270231 274577 275301 281385 289419 295815 296595 301365 311805 317655 333945 397657 406445 435305 450385 458835 482365 532467 731601 769119 783549 810693 823731 825903 844155 868257 887445 904095 935415 1001835 1131793 1192971 1219335 1254149 1281865 1305915 1351155 1372885 1376505 1447095 1988285 2194803 2307357 2350647 2432079 2471193 2604771 2662335 3332849 3395379 3569501 3578913 3658005 3762447 3845595 3917745 4053465 4118655 4129515 4341285 5658965 5964855 6270745 6922071 7413579 9998547 10186137 10708503 10736739 10974015 11287341 11536785 11753235 12160395 12355965 13023855 14713309 16303937 16664245 16976895 17847505 17894565 18812235 29995641 30558411 32125509 33862023 34610355 37067895 44139927 46403513 48911811 49992735 50930685 53542515 53683695 56436705 73566545 81519685 89986923 96376527 132419781 139210539 146735433 149978205 152792055 160627545 169310115 220699635 232017565 244559055 397259343 417631617 440206299 449934615 481882635 603245669 662098905 696052695 733677165 1252894851 1809737007 1986296715 2088158085 2201031495 3016228345 5429211021 6264474255 9048685035 16287633063 27146055105 81438165315
• Sum of all divisors σ(n): 165917606400
• Sum of proper divisors (its aliquot sum) s(n): 84479441085
• 81438165315 is an abundant number, because the sum of its proper divisors (84479441085) is greater than itself. Its abundance is 3041275770

Bases of 81438165315

• Binary: 1001011110110000101111100100101000011₂
• Hexadecimal: 0x12F617C943
• Base-36: 11EU6IIR

Squares and roots of 81438165315

• 81438165315 squared (81438165315²) is 6632174769873269049225
• 81438165315 cubed (81438165315³) is 540112145306911366430258422630875
• The square root of 81438165315 is 285373.7291955937
• The cube root of 81438165315 is 4334.5364598163

Scales and comparisons

• 81,438,165,315 seconds is equal to 2,589 years, 25 weeks, 8 hours, 35 minutes, 15 seconds.
• To count from 1 to 81,438,165,315 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 81438165315 cubic inches would be around 361.2 feet tall.

Recreational maths with 81438165315

• 81438165315 backwards is 51356183418
• 81438165315 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81438165315's digits is 45
• More coming soon!