81621292160

Names of 81621292160

• Cardinal: 81621292160 can be written as Eighty-one billion, six hundred twenty-one million, two hundred ninety-two thousand, one hundred sixty.

Scientific notation

• Scientific notation: 8.162129216 × 10¹⁰

Factors of 81621292160

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 671

Divisors of 81621292160

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 4 5 8 10 16 17 20 32 34 40 64 68 80 85 113 128 136 160 170 197 226 272 320 337 340 394 452 544 565 640 674 680 788 904 985 1088 1130 1348 1360 1576 1685 1808 1921 1970 2176 2260 2696 2720 3152 3349 3370 3616 3842 3940 4520 5392 5440 5729 6304 6698 6740 7232 7684 7880 9040 9605 10784 10880 11458 12608 13396 13480 14464 15368 15760 16745 18080 19210 21568 22261 22916 25216 26792 26960 28645 30736 31520 33490 36160 38081 38420 43136 44522 45832 53584 53920 57290 61472 63040 66389 66980 72320 76162 76840 89044 91664 107168 107840 111305 114580 122944 126080 132778 133960 152324 153680 178088 183328 190405 214336 215680 222610 229160 245888 265556 267920 304648 307360 331945 356176 366656 378437 380810 428672 445220 458320 531112 535840 609296 614720 647377 663890 712352 733312 756874 761620 890440 916640 1062224 1071680 1128613 1218592 1229440 1294754 1327780 1424704 1513748 1523240 1780880 1833280 1892185 2124448 2143360 2257226 2437184 2589508 2655560 2849408 3027496 3046480 3236885 3561760 3666560 3784370 4248896 4514452 4874368 5179016 5311120 5643065 6054992 6092960 6473770 7123520 7501957 7568740 8497792 9028904 10358032 10622240 11286130 12109984 12185920 12947540 14247040 15003914 15137480 18057808 20716064 21244480 22572260 24219968 24371840 25895080 30007828 30274960 36115616 37509785 41432128 42488960 45144520 48439936 51790160 60015656 60549920 72231232 75019570 82864256 90289040 103580320 120031312 121099840 127533269 144462464 150039140 180578080 207160640 240062624 242199680 255066538 300078280 361156160 414321280 480125248 510133076 600156560 637666345 722312320 960250496 1020266152 1200313120 1275332690 2040532304 2400626240 2550665380 4081064608 4801252480 5101330760 8162129216 10202661520 16324258432 20405323040 40810646080 81621292160
• Sum of all divisors σ(n): 210111913440
• Sum of proper divisors (its aliquot sum) s(n): 128490621280
• 81621292160 is an abundant number, because the sum of its proper divisors (128490621280) is greater than itself. Its abundance is 46869329120

Bases of 81621292160

• Binary: 1001100000001000000100001010010000000₂
• Hexadecimal: 0x1301021480
• Base-36: 11HV7K3K

Squares and roots of 81621292160

• 81621292160 squared (81621292160²) is 6662035333868077465600
• 81621292160 cubed (81621292160³) is 543763932365889493717249949696000
• The square root of 81621292160 is 285694.4034453597
• The cube root of 81621292160 is 4337.7829956073

Scales and comparisons

• 81,621,292,160 seconds is equal to 2,595 years, 15 weeks, 5 days, 21 hours, 9 minutes, 20 seconds.
• To count from 1 to 81,621,292,160 would take you about five thousand, one hundred ninety 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 81621292160 cubic inches would be around 361.5 feet tall.

Recreational maths with 81621292160

• 81621292160 backwards is 06129212618
• The number of decimal digits it has is: 11
• The sum of 81621292160's digits is 38
• More coming soon!