81980721

81,980,721 is an odd composite number composed of three prime numbers multiplied together.

What does the number 81980721 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 16 divisors.

81980721 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 81980721:

3³ × 173 × 17551

(3 × 3 × 3 × 173 × 17551)

See below for interesting mathematical facts about the number 81980721 from the Numbermatics database.

Names of 81980721

Cardinal: 81980721 can be written as Eighty-one million, nine hundred eighty thousand, seven hundred twenty-one.

Scientific notation

Scientific notation: 8.1980721 × 10⁷

Factors of 81980721

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 5
Sum of prime factors: 17727

Divisors of 81980721

Number of divisors d(n): 16
Complete list of divisors:
1 3 9 27 173 519 1557 4671 17551 52653 157959 473877 3036323 9108969 27326907 81980721
Sum of all divisors σ(n): 122161920
Sum of proper divisors (its aliquot sum) s(n): 40181199
81980721 is a deficient number, because the sum of its proper divisors (40181199) is less than itself. Its deficiency is 41799522

Bases of 81980721

Binary: 100111000101110110100110001₂
Hexadecimal: 0x4E2ED31
Base-36: 1CT4Q9

Squares and roots of 81980721

81980721 squared (81980721²) is 6720838615679841
81980721 cubed (81980721³) is 550979195438075270345361
The square root of 81980721 is 9054.3205708657
The cube root of 81980721 is 434.4140982421

Scales and comparisons

How big is 81980721?

81,980,721 seconds is equal to 2 years, 31 weeks, 3 days, 20 hours, 25 minutes, 21 seconds.
To count from 1 to 81,980,721 would take you about three years!

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 81980721 cubic inches would be around 36.2 feet tall.

Recreational maths with 81980721

81980721 backwards is 12708918
The number of decimal digits it has is: 8
The sum of 81980721's digits is 36
More coming soon!

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The information we have on file for 81980721 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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