81028740
81,028,740 is an even composite number composed of six prime numbers multiplied together.
81028740 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred forty-four divisors.
Prime factorization of 81028740:
22 × 3 × 5 × 132 × 61 × 131
(2 × 2 × 3 × 5 × 13 × 13 × 61 × 131)See below for interesting mathematical facts about the number 81028740 from the Numbermatics database.
Names of 81028740
- Cardinal: 81028740 can be written as Eighty-one million, twenty-eight thousand, seven hundred forty.
Scientific notation
- Scientific notation: 8.102874 × 107
Factors of 81028740
Divisors of 81028740
- Number of divisors d(n): 144
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Complete list of divisors:
1 2 3 4 5 6 10 12 13 15 20 26 30 39 52 60 61 65 78 122 130 131 156 169 183 195 244 260 262 305 338 366 390 393 507 524 610 655 676 732 780 786 793 845 915 1014 1220 1310 1572 1586 1690 1703 1830 1965 2028 2379 2535 2620 3172 3380 3406 3660 3930 3965 4758 5070 5109 6812 7860 7930 7991 8515 9516 10140 10218 10309 11895 15860 15982 17030 20436 20618 22139 23790 23973 25545 30927 31964 34060 39955 41236 44278 47580 47946 51090 51545 61854 66417 79910 88556 95892 102180 103090 103883 110695 119865 123708 132834 154635 159820 206180 207766 221390 239730 265668 309270 311649 332085 415532 442780 479460 519415 618540 623298 664170 1038830 1246596 1328340 1350479 1558245 2077660 2700958 3116490 4051437 5401916 6232980 6752395 8102874 13504790 16205748 20257185 27009580 40514370 81028740
- Sum of all divisors σ(n): 251608896
- Sum of proper divisors (its aliquot sum) s(n): 170580156
- 81028740 is an abundant number, because the sum of its proper divisors (170580156) is greater than itself. Its abundance is 89551416
Bases of 81028740
- Binary: 1001101010001100110100001002
- Hexadecimal: 0x4D46684
- Base-36: 1C8Q6C
Squares and roots of 81028740
- 81028740 squared (810287402) is 6565656705987600
- 81028740 cubed (810287403) is 532006890158725683624000
-
The
square root of 81028740 is 9001.5965250615 -
The
cube root of 81028740 is 432.7260381925
Scales and comparisons
How big is 81028740?- 81,028,740 seconds is equal to 2 years, 29 weeks, 6 days, 19 hours, 59 minutes.
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To count from 1 to 81,028,740 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 81028740 cubic inches would be around 36.1 feet tall.
Recreational maths with 81028740
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