81901328640

Names of 81901328640

• Cardinal: 81901328640 can be written as Eighty-one billion, nine hundred one million, three hundred twenty-eight thousand, six hundred forty.

Scientific notation

• Scientific notation: 8.190132864 × 10¹⁰

Factors of 81901328640

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 4312

Divisors of 81901328640

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 64 71 80 96 120 128 142 160 192 213 240 256 284 320 355 384 426 480 568 640 710 768 852 960 1065 1136 1280 1420 1704 1920 2130 2272 2840 3408 3840 4231 4260 4544 5041 5680 6816 8462 8520 9088 10082 11360 12693 13632 15123 16924 17040 18176 20164 21155 22720 25205 25386 27264 30246 33848 34080 40328 42310 45440 50410 50772 54528 60492 63465 67696 68160 75615 80656 84620 90880 100820 101544 120984 126930 135392 136320 151230 161312 169240 201640 203088 241968 253860 270784 272640 300401 302460 322624 338480 403280 406176 483936 507720 541568 600802 604920 645248 676960 806560 812352 901203 967872 1015440 1083136 1201604 1209840 1290496 1353920 1502005 1613120 1624704 1802406 1935744 2030880 2403208 2419680 2707840 3004010 3226240 3249408 3604812 3871488 4061760 4506015 4806416 4839360 5415680 6008020 6452480 7209624 8123520 9012030 9612832 9678720 12016040 14419248 16247040 18024060 19225664 19357440 21328471 24032080 28838496 36048120 38451328 42656942 48064160 57676992 63985413 72096240 76902656 85313884 96128320 106642355 115353984 127970826 144192480 170627768 192256640 213284710 230707968 255941652 288384960 319927065 341255536 384513280 426569420 511883304 576769920 639854130 682511072 853138840 1023766608 1153539840 1279708260 1365022144 1706277680 2047533216 2559416520 2730044288 3412555360 4095066432 5118833040 5460088576 6825110720 8190132864 10237666080 13650221440 16380265728 20475332160 27300442880 40950664320 81901328640
• Sum of all divisors σ(n): 265371081024
• Sum of proper divisors (its aliquot sum) s(n): 183469752384
• 81901328640 is an abundant number, because the sum of its proper divisors (183469752384) is greater than itself. Its abundance is 101568423744

Bases of 81901328640

• Binary: 1001100010001101100110001100100000000₂
• Hexadecimal: 0x1311B31900
• Base-36: 11MHXPMO

Squares and roots of 81901328640

• 81901328640 squared (81901328640²) is 6707827632997284249600
• 81901328640 cubed (81901328640³) is 549379995430583885553985388544000
• The square root of 81901328640 is 286184.0817376117
• The cube root of 81901328640 is 4342.7382013989

Scales and comparisons

• 81,901,328,640 seconds is equal to 2,604 years, 10 weeks, 6 days, 1 hour, 4 minutes.
• To count from 1 to 81,901,328,640 would take you about five thousand, two hundred 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 81901328640 cubic inches would be around 361.9 feet tall.

Recreational maths with 81901328640

• 81901328640 backwards is 04682310918
• The number of decimal digits it has is: 11
• The sum of 81901328640's digits is 42
• More coming soon!