81220729

81,220,729 is an odd composite number composed of three prime numbers multiplied together.

What does the number 81220729 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

81220729 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 81220729:

83 × 491 × 1993

See below for interesting mathematical facts about the number 81220729 from the Numbermatics database.

Names of 81220729

Cardinal: 81220729 can be written as Eighty-one million, two hundred twenty thousand, seven hundred twenty-nine.

Scientific notation

Scientific notation: 8.1220729 × 10⁷

Factors of 81220729

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 3
Sum of prime factors: 2567

Divisors of 81220729

Number of divisors d(n): 8
Complete list of divisors:
1 83 491 1993 40753 165419 978563 81220729
Sum of all divisors σ(n): 82408032
Sum of proper divisors (its aliquot sum) s(n): 1187303
81220729 is a deficient number, because the sum of its proper divisors (1187303) is less than itself. Its deficiency is 80033426

Bases of 81220729

Binary: 100110101110101010001111001₂
Hexadecimal: 0x4D75479
Base-36: 1CCUBD

Squares and roots of 81220729

81220729 squared (81220729²) is 6596806819291441
81220729 cubed (81220729³) is 535797458935022101480489
The square root of 81220729 is 9012.2543794547
The cube root of 81220729 is 433.0675347621

Scales and comparisons

How big is 81220729?

81,220,729 seconds is equal to 2 years, 30 weeks, 2 days, 1 hour, 18 minutes, 49 seconds.
To count from 1 to 81,220,729 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 81220729 cubic inches would be around 36.1 feet tall.

Recreational maths with 81220729

81220729 backwards is 92702218
The number of decimal digits it has is: 8
The sum of 81220729's digits is 31
More coming soon!

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The information we have on file for 81220729 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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