81720

81,720 is an even composite number composed of four prime numbers multiplied together.

What does the number 81720 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 48 divisors.

81720 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 81720:

2³ × 3² × 5 × 227

(2 × 2 × 2 × 3 × 3 × 5 × 227)

See below for interesting mathematical facts about the number 81720 from the Numbermatics database.

Names of 81720

Cardinal: 81720 can be written as Eighty-one thousand, seven hundred twenty.

Scientific notation

Scientific notation: 8.172 × 10⁴

Factors of 81720

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 7
Sum of prime factors: 237

Divisors of 81720

Number of divisors d(n): 48
Complete list of divisors:
1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 90 120 180 227 360 454 681 908 1135 1362 1816 2043 2270 2724 3405 4086 4540 5448 6810 8172 9080 10215 13620 16344 20430 27240 40860 81720
Sum of all divisors σ(n): 266760
Sum of proper divisors (its aliquot sum) s(n): 185040
81720 is an abundant number, because the sum of its proper divisors (185040) is greater than itself. Its abundance is 103320

Bases of 81720

Binary: 10011111100111000₂
Hexadecimal: 0x13F38
Base-36: 1R20

Squares and roots of 81720

81720 squared (81720²) is 6678158400
81720 cubed (81720³) is 545739104448000
The square root of 81720 is 285.8671019899
The cube root of 81720 is 43.3953090841

Scales and comparisons

How big is 81720?

81,720 seconds is equal to 22 hours, 42 minutes.
To count from 1 to 81,720 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 81720 cubic inches would be around 3.6 feet tall.

Recreational maths with 81720

81720 backwards is 02718
81720 is a Harshad number.
The number of decimal digits it has is: 5
The sum of 81720's digits is 18
More coming soon!

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The information we have on file for 81720 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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