81440

81,440 is an even composite number composed of three prime numbers multiplied together.

What does the number 81440 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 24 divisors.

81440 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 81440:

2⁵ × 5 × 509

(2 × 2 × 2 × 2 × 2 × 5 × 509)

See below for interesting mathematical facts about the number 81440 from the Numbermatics database.

Names of 81440

Cardinal: 81440 can be written as Eighty-one thousand, four hundred forty.

Scientific notation

Scientific notation: 8.144 × 10⁴

Factors of 81440

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 7
Sum of prime factors: 516

Divisors of 81440

Number of divisors d(n): 24
Complete list of divisors:
1 2 4 5 8 10 16 20 32 40 80 160 509 1018 2036 2545 4072 5090 8144 10180 16288 20360 40720 81440
Sum of all divisors σ(n): 192780
Sum of proper divisors (its aliquot sum) s(n): 111340
81440 is an abundant number, because the sum of its proper divisors (111340) is greater than itself. Its abundance is 29900

Bases of 81440

Binary: 10011111000100000₂
Hexadecimal: 0x13E20
Base-36: 1QU8

Squares and roots of 81440

81440 squared (81440²) is 6632473600
81440 cubed (81440³) is 540148649984000
The square root of 81440 is 285.3769437077
The cube root of 81440 is 43.3456900987

Scales and comparisons

How big is 81440?

81,440 seconds is equal to 22 hours, 37 minutes, 20 seconds.
To count from 1 to 81,440 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 81440 cubic inches would be around 3.6 feet tall.

Recreational maths with 81440

81440 backwards is 04418
The number of decimal digits it has is: 5
The sum of 81440's digits is 17
More coming soon!

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The information we have on file for 81440 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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