81472771728

Names of 81472771728

• Cardinal: 81472771728 can be written as Eighty-one billion, four hundred seventy-two million, seven hundred seventy-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1472771728 × 10¹⁰

Factors of 81472771728

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 663

Divisors of 81472771728

• Number of divisors d(n): 210
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 17 18 24 27 34 36 48 51 54 68 72 81 102 108 136 144 153 162 204 216 243 272 306 324 408 432 459 486 612 641 648 729 816 918 972 1224 1282 1296 1377 1458 1836 1923 1944 2448 2564 2754 2916 3672 3846 3888 4131 5128 5508 5769 5832 7344 7692 8262 10256 10897 11016 11538 11664 12393 15384 16524 17307 21794 22032 23076 24786 30768 32691 33048 34614 43588 46152 49572 51921 65382 66096 69228 87176 92304 98073 99144 103842 130764 138456 155763 174352 196146 198288 207684 261528 276912 294219 311526 392292 410881 415368 467289 523056 588438 623052 784584 821762 830736 882657 934578 1176876 1232643 1246104 1569168 1643524 1765314 1869156 2353752 2465286 2492208 2647971 3287048 3530628 3697929 3738312 4707504 4930572 5295942 6574096 6984977 7061256 7395858 7476624 7943913 9861144 10591884 11093787 13969954 14122512 14791716 15887826 19722288 20954931 21183768 22187574 27939908 29583432 31775652 33281361 41909862 42367536 44375148 55879816 59166864 62864793 63551304 66562722 83819724 88750296 99844083 111759632 125729586 127102608 133125444 167639448 177500592 188594379 199688166 251459172 266250888 299532249 335278896 377188758 399376332 502918344 532501776 565783137 599064498 754377516 798752664 1005836688 1131566274 1198128996 1508755032 1597505328 1697349411 2263132548 2396257992 3017510064 3394698822 4526265096 4792515984 5092048233 6789397644 9052530192 10184096466 13578795288 20368192932 27157590576 40736385864 81472771728
• Sum of all divisors σ(n): 250985408562
• Sum of proper divisors (its aliquot sum) s(n): 169512636834
• 81472771728 is an abundant number, because the sum of its proper divisors (169512636834) is greater than itself. Its abundance is 88039865106

Bases of 81472771728

• Binary: 1001011111000001001111101011010010000₂
• Hexadecimal: 0x12F827D690
• Base-36: 11FES900

Squares and roots of 81472771728

• 81472771728 squared (81472771728²) is 6637812533042796105984
• 81472771728 cubed (81472771728³) is 540800985277853184397681726820352
• The square root of 81472771728 is 285434.3562502595
• The cube root of 81472771728 is 4335.1503469127

Scales and comparisons

• 81,472,771,728 seconds is equal to 2,590 years, 30 weeks, 1 day, 21 hours, 28 minutes, 48 seconds.
• To count from 1 to 81,472,771,728 would take you about five thousand, one hundred eighty-one 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 81472771728 cubic inches would be around 361.3 feet tall.

Recreational maths with 81472771728

• 81472771728 backwards is 82717727418
• 81472771728 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81472771728's digits is 54
• More coming soon!