81640

81,640 is an even composite number composed of four prime numbers multiplied together.

What does the number 81640 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 32 divisors.

81640 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of thirty-two divisors.

Prime factorization of 81640:

2³ × 5 × 13 × 157

(2 × 2 × 2 × 5 × 13 × 157)

See below for interesting mathematical facts about the number 81640 from the Numbermatics database.

Names of 81640

Cardinal: 81640 can be written as Eighty-one thousand, six hundred forty.

Scientific notation

Scientific notation: 8.164 × 10⁴

Factors of 81640

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 6
Sum of prime factors: 177

Divisors of 81640

Number of divisors d(n): 32
Complete list of divisors:
1 2 4 5 8 10 13 20 26 40 52 65 104 130 157 260 314 520 628 785 1256 1570 2041 3140 4082 6280 8164 10205 16328 20410 40820 81640
Sum of all divisors σ(n): 199080
Sum of proper divisors (its aliquot sum) s(n): 117440
81640 is an abundant number, because the sum of its proper divisors (117440) is greater than itself. Its abundance is 35800

Bases of 81640

Binary: 10011111011101000₂
Hexadecimal: 0x13EE8
Base-36: 1QZS

Squares and roots of 81640

81640 squared (81640²) is 6665089600
81640 cubed (81640³) is 544137914944000
The square root of 81640 is 285.7271425679
The cube root of 81640 is 43.3811438117

Scales and comparisons

How big is 81640?

81,640 seconds is equal to 22 hours, 40 minutes, 40 seconds.
To count from 1 to 81,640 would take you about twenty-two hours.

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 81640 cubic inches would be around 3.6 feet tall.

Recreational maths with 81640

81640 backwards is 04618
The number of decimal digits it has is: 5
The sum of 81640's digits is 19
More coming soon!

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The information we have on file for 81640 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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