81531072
81,531,072 is an even composite number composed of five prime numbers multiplied together.
81531072 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred sixty-eight divisors.
Prime factorization of 81531072:
26 × 32 × 7 × 73 × 277
(2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 7 × 73 × 277)See below for interesting mathematical facts about the number 81531072 from the Numbermatics database.
Names of 81531072
- Cardinal: 81531072 can be written as Eighty-one million, five hundred thirty-one thousand and seventy-two.
Scientific notation
- Scientific notation: 8.1531072 × 107
Factors of 81531072
Divisors of 81531072
- Number of divisors d(n): 168
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Complete list of divisors:
1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 32 36 42 48 56 63 64 72 73 84 96 112 126 144 146 168 192 219 224 252 277 288 292 336 438 448 504 511 554 576 584 657 672 831 876 1008 1022 1108 1168 1314 1344 1533 1662 1752 1939 2016 2044 2216 2336 2493 2628 3066 3324 3504 3878 4032 4088 4432 4599 4672 4986 5256 5817 6132 6648 7008 7756 8176 8864 9198 9972 10512 11634 12264 13296 14016 15512 16352 17451 17728 18396 19944 20221 21024 23268 24528 26592 31024 32704 34902 36792 39888 40442 42048 46536 49056 53184 60663 62048 69804 73584 79776 80884 93072 98112 121326 124096 139608 141547 147168 159552 161768 181989 186144 242652 279216 283094 294336 323536 363978 372288 424641 485304 558432 566188 647072 727956 849282 970608 1116864 1132376 1273923 1294144 1455912 1698564 1941216 2264752 2547846 2911824 3397128 3882432 4529504 5095692 5823648 6794256 9059008 10191384 11647296 13588512 20382768 27177024 40765536 81531072
- Sum of all divisors σ(n): 271714976
- Sum of proper divisors (its aliquot sum) s(n): 190183904
- 81531072 is an abundant number, because the sum of its proper divisors (190183904) is greater than itself. Its abundance is 108652832
Bases of 81531072
- Binary: 1001101110000010000110000002
- Hexadecimal: 0x4DC10C0
- Base-36: 1CJHS0
Squares and roots of 81531072
- 81531072 squared (815310722) is 6647315701469184
- 81531072 cubed (815310723) is 541962775063214546485248
-
The
square root of 81531072 is 9029.4557975551 -
The
cube root of 81531072 is 433.6184149077
Scales and comparisons
How big is 81531072?- 81,531,072 seconds is equal to 2 years, 30 weeks, 5 days, 15 hours, 31 minutes, 12 seconds.
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To count from 1 to 81,531,072 would take you about three 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 81531072 cubic inches would be around 36.1 feet tall.
Recreational maths with 81531072
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