81830720
81,830,720 is an even composite number composed of five prime numbers multiplied together.
81830720 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred twelve divisors.
Prime factorization of 81830720:
26 × 5 × 19 × 43 × 313
(2 × 2 × 2 × 2 × 2 × 2 × 5 × 19 × 43 × 313)See below for interesting mathematical facts about the number 81830720 from the Numbermatics database.
Names of 81830720
- Cardinal: 81830720 can be written as Eighty-one million, eight hundred thirty thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 8.183072 × 107
Factors of 81830720
Divisors of 81830720
- Number of divisors d(n): 112
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Complete list of divisors:
1 2 4 5 8 10 16 19 20 32 38 40 43 64 76 80 86 95 152 160 172 190 215 304 313 320 344 380 430 608 626 688 760 817 860 1216 1252 1376 1520 1565 1634 1720 2504 2752 3040 3130 3268 3440 4085 5008 5947 6080 6260 6536 6880 8170 10016 11894 12520 13072 13459 13760 16340 20032 23788 25040 26144 26918 29735 32680 47576 50080 52288 53836 59470 65360 67295 95152 100160 107672 118940 130720 134590 190304 215344 237880 255721 261440 269180 380608 430688 475760 511442 538360 861376 951520 1022884 1076720 1278605 1903040 2045768 2153440 2557210 4091536 4306880 5114420 8183072 10228840 16366144 20457680 40915360 81830720
- Sum of all divisors σ(n): 210555840
- Sum of proper divisors (its aliquot sum) s(n): 128725120
- 81830720 is an abundant number, because the sum of its proper divisors (128725120) is greater than itself. Its abundance is 46894400
Bases of 81830720
- Binary: 1001110000010100011010000002
- Hexadecimal: 0x4E0A340
- Base-36: 1CPWZK
Squares and roots of 81830720
- 81830720 squared (818307202) is 6696266735718400
- 81830720 cubed (818307203) is 547960328295886389248000
-
The
square root of 81830720 is 9046.0333848599 -
The
cube root of 81830720 is 434.1489857797
Scales and comparisons
How big is 81830720?- 81,830,720 seconds is equal to 2 years, 31 weeks, 2 days, 2 hours, 45 minutes, 20 seconds.
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To count from 1 to 81,830,720 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 81830720 cubic inches would be around 36.2 feet tall.
Recreational maths with 81830720
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