27991

27,991 is an odd composite number composed of two prime numbers multiplied together.

What does the number 27991 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

27991 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 27991:

23 × 1217

See below for interesting mathematical facts about the number 27991 from the Numbermatics database.

Names of 27991

Cardinal: 27991 can be written as Twenty-seven thousand, nine hundred ninety-one.

Scientific notation

Scientific notation: 2.7991 × 10⁴

Factors of 27991

Number of distinct prime factors ω(n): 2
Total number of prime factors Ω(n): 2
Sum of prime factors: 1240

Divisors of 27991

Number of divisors d(n): 4
Complete list of divisors:
1 23 1217 27991
Sum of all divisors σ(n): 29232
Sum of proper divisors (its aliquot sum) s(n): 1241
27991 is a deficient number, because the sum of its proper divisors (1241) is less than itself. Its deficiency is 26750

Bases of 27991

Binary: 110110101010111₂
Hexadecimal: 0x6D57
Base-36: LLJ

Squares and roots of 27991

27991 squared (27991²) is 783496081
27991 cubed (27991³) is 21930838803271
The square root of 27991 is 167.3051105017
The cube root of 27991 is 30.3626358819

Scales and comparisons

How big is 27991?

27,991 seconds is equal to 7 hours, 46 minutes, 31 seconds.
To count from 1 to 27,991 would take you about seven 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 27991 cubic inches would be around 2.5 feet tall.

Recreational maths with 27991

27991 backwards is 19972
The number of decimal digits it has is: 5
The sum of 27991's digits is 28
More coming soon!

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The information we have on file for 27991 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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