81855

81,855 is an odd composite number composed of four prime numbers multiplied together.

What does the number 81855 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

81855 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 81855:

3² × 5 × 17 × 107

(3 × 3 × 5 × 17 × 107)

See below for interesting mathematical facts about the number 81855 from the Numbermatics database.

Names of 81855

Cardinal: 81855 can be written as Eighty-one thousand, eight hundred fifty-five.

Scientific notation

Scientific notation: 8.1855 × 10⁴

Factors of 81855

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 132

Divisors of 81855

Number of divisors d(n): 24
Complete list of divisors:
1 3 5 9 15 17 45 51 85 107 153 255 321 535 765 963 1605 1819 4815 5457 9095 16371 27285 81855
Sum of all divisors σ(n): 151632
Sum of proper divisors (its aliquot sum) s(n): 69777
81855 is a deficient number, because the sum of its proper divisors (69777) is less than itself. Its deficiency is 12078

Bases of 81855

Binary: 10011111110111111₂
Hexadecimal: 0x13FBF
Base-36: 1R5R

Squares and roots of 81855

81855 squared (81855²) is 6700241025
81855 cubed (81855³) is 548448229101375
The square root of 81855 is 286.1031282597
The cube root of 81855 is 43.4191920327

Scales and comparisons

How big is 81855?

81,855 seconds is equal to 22 hours, 44 minutes, 15 seconds.
To count from 1 to 81,855 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 81855 cubic inches would be around 3.6 feet tall.

Recreational maths with 81855

81855 backwards is 55818
The number of decimal digits it has is: 5
The sum of 81855's digits is 27
More coming soon!

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The information we have on file for 81855 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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