81388371968000

Names of 81388371968000

• Cardinal: 81388371968000 can be written as Eighty-one trillion, three hundred eighty-eight billion, three hundred seventy-one million, nine hundred sixty-eight thousand.

Scientific notation

• Scientific notation: 8.1388371968 × 10¹³

Factors of 81388371968000

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 29
• Sum of prime factors: 204

Divisors of 81388371968000

• Number of divisors d(n): 300
• Complete list of divisors:
  1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 125 128 160 197 200 250 256 320 394 400 500 512 640 788 800 985 1000 1024 1280 1576 1600 1970 2000 2048 2560 3152 3200 3940 4000 4096 4925 5120 6304 6400 7880 8000 8192 9850 10240 12608 12800 15760 16000 16384 19700 20480 24625 25216 25600 31520 32000 32768 38809 39400 40960 49250 50432 51200 63040 64000 65536 77618 78800 81920 98500 100864 102400 126080 128000 131072 155236 157600 163840 194045 197000 201728 204800 252160 256000 262144 310472 315200 327680 388090 394000 403456 409600 504320 512000 524288 620944 630400 655360 776180 788000 806912 819200 970225 1008640 1024000 1048576 1241888 1260800 1310720 1552360 1576000 1613824 1638400 1940450 2017280 2048000 2097152 2483776 2521600 2621440 3104720 3152000 3227648 3276800 3880900 4034560 4096000 4194304 4851125 4967552 5043200 5242880 6209440 6304000 6455296 6553600 7761800 8069120 8192000 8388608 9702250 9935104 10086400 10485760 12418880 12608000 12910592 13107200 15523600 16138240 16384000 16777216 19404500 19870208 20172800 20971520 24837760 25216000 25821184 26214400 31047200 32276480 32768000 38809000 39740416 40345600 41943040 49675520 50432000 51642368 52428800 62094400 64552960 65536000 77618000 79480832 80691200 83886080 99351040 100864000 103284736 104857600 124188800 129105920 131072000 155236000 158961664 161382400 198702080 201728000 206569472 209715200 248377600 258211840 262144000 310472000 317923328 322764800 397404160 403456000 413138944 419430400 496755200 516423680 524288000 620944000 635846656 645529600 794808320 806912000 826277888 993510400 1032847360 1048576000 1241888000 1271693312 1291059200 1589616640 1613824000 1652555776 1987020800 2065694720 2097152000 2483776000 2543386624 2582118400 3179233280 3227648000 3305111552 3974041600 4131389440 4967552000 5086773248 5164236800 6358466560 6455296000 7948083200 8262778880 9935104000 10173546496 10328473600 12716933120 12910592000 15896166400 16525557760 19870208000 20347092992 20656947200 25433866240 25821184000 31792332800 39740416000 40694185984 41313894400 50867732480 51642368000 63584665600 79480832000 81388371968 82627788800 101735464960 103284736000 127169331200 158961664000 162776743936 203470929920 206569472000 254338662400 317923328000 325553487872 406941859840 413138944000 508677324800 635846656000 651106975744 813883719680 1017354649600 1271693312000 1627767439360 2034709299200 2543386624000 3255534878720 4069418598400 5086773248000 8138837196800 10173546496000 16277674393600 20347092992000 40694185984000 81388371968000
• Sum of all divisors σ(n): 204181799642652
• Sum of proper divisors (its aliquot sum) s(n): 122793427674652
• 81388371968000 is an abundant number, because the sum of its proper divisors (122793427674652) is greater than itself. Its abundance is 41405055706652

Bases of 81388371968000

• Binary: 10010100000010110110101000000000000000000000000₂
• Hexadecimal: 0x4A05B5000000
• Base-36: SULAVA8E8

Squares and roots of 81388371968000

• 81388371968000 squared (81388371968000²) is 6624067091601528193024000000
• 81388371968000 cubed (81388371968000³) is 539122036392253105411076214751232000000000
• The square root of 81388371968000 is 9021550.4193015515
• The cube root of 81388371968000 is 43336.5286475863

Scales and comparisons

• 81,388,371,968,000 seconds is equal to 2,587,898 years, 24 weeks, 5 days, 22 hours, 13 minutes, 20 seconds.
• To count from 1 to 81,388,371,968,000 would take you about six million, four hundred sixty-nine thousand, seven hundred forty-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 81388371968000 cubic inches would be around 3611.4 feet tall.

Recreational maths with 81388371968000

• 81388371968000 backwards is 00086917388318
• The number of decimal digits it has is: 14
• The sum of 81388371968000's digits is 62
• More coming soon!