81987290
81,987,290 is an even composite number composed of six prime numbers multiplied together.
81987290 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred twenty-eight divisors.
Prime factorization of 81987290:
2 × 5 × 73 × 11 × 41 × 53
(2 × 5 × 7 × 7 × 7 × 11 × 41 × 53)See below for interesting mathematical facts about the number 81987290 from the Numbermatics database.
Names of 81987290
- Cardinal: 81987290 can be written as Eighty-one million, nine hundred eighty-seven thousand, two hundred ninety.
Scientific notation
- Scientific notation: 8.198729 × 107
Factors of 81987290
Divisors of 81987290
- Number of divisors d(n): 128
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Complete list of divisors:
1 2 5 7 10 11 14 22 35 41 49 53 55 70 77 82 98 106 110 154 205 245 265 287 343 371 385 410 451 490 530 539 574 583 686 742 770 902 1078 1166 1435 1715 1855 2009 2173 2255 2597 2695 2870 2915 3157 3430 3710 3773 4018 4081 4346 4510 5194 5390 5830 6314 7546 8162 10045 10865 12985 14063 15211 15785 18179 18865 20090 20405 21730 22099 23903 25970 28126 28567 30422 31570 36358 37730 40810 44198 47806 57134 70315 76055 90895 106477 110495 119515 140630 142835 152110 154693 167321 181790 199969 212954 220990 239030 285670 309386 334642 399938 532385 745339 773465 836605 999845 1064770 1171247 1490678 1546930 1673210 1999690 2342494 3726695 5856235 7453390 8198729 11712470 16397458 40993645 81987290
- Sum of all divisors σ(n): 195955200
- Sum of proper divisors (its aliquot sum) s(n): 113967910
- 81987290 is an abundant number, because the sum of its proper divisors (113967910) is greater than itself. Its abundance is 31980620
Bases of 81987290
- Binary: 1001110001100000110110110102
- Hexadecimal: 0x4E306DA
- Base-36: 1CT9SQ
Squares and roots of 81987290
- 81987290 squared (819872902) is 6721915721544100
- 81987290 cubed (819872903) is 551111653617795374489000
-
The
square root of 81987290 is 9054.6833185927 -
The
cube root of 81987290 is 434.4257009293
Scales and comparisons
How big is 81987290?- 81,987,290 seconds is equal to 2 years, 31 weeks, 3 days, 22 hours, 14 minutes, 50 seconds.
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To count from 1 to 81,987,290 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 81987290 cubic inches would be around 36.2 feet tall.
Recreational maths with 81987290
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The information we have on file for 81987290 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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