81949278720

Names of 81949278720

• Cardinal: 81949278720 can be written as Eighty-one billion, nine hundred forty-nine million, two hundred seventy-eight thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.194927872 × 10¹⁰

Factors of 81949278720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 344250

Divisors of 81949278720

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 31 32 40 48 60 62 64 80 93 96 120 124 128 155 160 186 192 240 248 256 310 320 372 384 465 480 496 512 620 640 744 768 930 960 992 1240 1280 1488 1536 1860 1920 1984 2480 2560 2976 3720 3840 3968 4960 5952 7440 7680 7936 9920 11904 14880 15872 19840 23808 29760 39680 47616 59520 79360 119040 238080 344209 688418 1032627 1376836 1721045 2065254 2753672 3442090 4130508 5163135 5507344 6884180 8261016 10326270 10670479 11014688 13768360 16522032 20652540 21340958 22029376 27536720 32011437 33044064 41305080 42681916 44058752 53352395 55073440 64022874 66088128 82610160 85363832 88117504 106704790 110146880 128045748 132176256 160057185 165220320 170727664 176235008 213409580 220293760 256091496 264352512 320114370 330440640 341455328 426819160 440587520 512182992 528705024 640228740 660881280 682910656 853638320 881175040 1024365984 1280457480 1321762560 1365821312 1707276640 2048731968 2560914960 2643525120 2731642624 3414553280 4097463936 5121829920 5463285248 6829106560 8194927872 10243659840 13658213120 16389855744 20487319680 27316426240 40974639360 81949278720
• Sum of all divisors σ(n): 270433405440
• Sum of proper divisors (its aliquot sum) s(n): 188484126720
• 81949278720 is an abundant number, because the sum of its proper divisors (188484126720) is greater than itself. Its abundance is 106534848000

Bases of 81949278720

• Binary: 1001100010100100011101100001000000000₂
• Hexadecimal: 0x13148EC200
• Base-36: 11NAHG5C

Squares and roots of 81949278720

• 81949278720 squared (81949278720²) is 6715684282728244838400
• 81949278720 cubed (81949278720³) is 550345483080820218278442958848000
• The square root of 81949278720 is 286267.8443695693
• The cube root of 81949278720 is 4343.5855381597

Scales and comparisons

• 81,949,278,720 seconds is equal to 2,605 years, 38 weeks, 1 day, 32 minutes.
• To count from 1 to 81,949,278,720 would take you about five thousand, two hundred eleven 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 81949278720 cubic inches would be around 362 feet tall.

Recreational maths with 81949278720

• 81949278720 backwards is 02787294918
• The number of decimal digits it has is: 11
• The sum of 81949278720's digits is 57
• More coming soon!