21809728

21,809,728 is an even composite number composed of two prime numbers multiplied together.

What does the number 21809728 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 14 divisors.

21809728 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of fourteen divisors.

Prime factorization of 21809728:

2⁶ × 340777

(2 × 2 × 2 × 2 × 2 × 2 × 340777)

See below for interesting mathematical facts about the number 21809728 from the Numbermatics database.

Names of 21809728

Cardinal: 21809728 can be written as Twenty-one million, eight hundred nine thousand, seven hundred twenty-eight.

Scientific notation

Scientific notation: 2.1809728 × 10⁷

Factors of 21809728

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 7
Sum of prime factors: 340779

Divisors of 21809728

Number of divisors d(n): 14
Complete list of divisors:
1 2 4 8 16 32 64 340777 681554 1363108 2726216 5452432 10904864 21809728
Sum of all divisors σ(n): 43278806
Sum of proper divisors (its aliquot sum) s(n): 21469078
21809728 is a deficient number, because the sum of its proper divisors (21469078) is less than itself. Its deficiency is 340650

Bases of 21809728

Binary: 1010011001100101001000000₂
Hexadecimal: 0x14CCA40
Base-36: CZGHS

Squares and roots of 21809728

21809728 squared (21809728²) is 475664235433984
21809728 cubed (21809728³) is 10374107594143152996352
The square root of 21809728 is 4670.0886501221
The cube root of 21809728 is 279.3937905239

Scales and comparisons

How big is 21809728?

21,809,728 seconds is equal to 36 weeks, 10 hours, 15 minutes, 28 seconds.
To count from 1 to 21,809,728 would take you about two weeks!

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 21809728 cubic inches would be around 23.3 feet tall.

Recreational maths with 21809728

21809728 backwards is 82790812
The number of decimal digits it has is: 8
The sum of 21809728's digits is 37
More coming soon!

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The information we have on file for 21809728 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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