# 28821

## 28,821 is an odd composite number composed of three prime numbers multiplied together.

What does the number 28821 look like?

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

28821 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 28821:

### 3 × 13 × 739

See below for interesting mathematical facts about the number 28821 from the Numbermatics database.

### Names of 28821

• Cardinal: 28821 can be written as Twenty-eight thousand, eight hundred twenty-one.

### Scientific notation

• Scientific notation: 2.8821 × 104

### Factors of 28821

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 755

### Divisors of 28821

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 41440
• Sum of proper divisors (its aliquot sum) s(n): 12619
• 28821 is a deficient number, because the sum of its proper divisors (12619) is less than itself. Its deficiency is 16202

### Bases of 28821

• Binary: 1110000100101012
• Base-36: M8L

### Squares and roots of 28821

• 28821 squared (288212) is 830650041
• 28821 cubed (288213) is 23940164831661
• The square root of 28821 is 169.7674880535
• The cube root of 28821 is 30.6598257161

### Scales and comparisons

How big is 28821?
• 28,821 seconds is equal to 8 hours, 21 seconds.
• To count from 1 to 28,821 would take you about eight 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 28821 cubic inches would be around 2.6 feet tall.

### Recreational maths with 28821

• 28821 backwards is 12882
• The number of decimal digits it has is: 5
• The sum of 28821's digits is 21
• More coming soon!

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"Number 28821 - Facts about the integer". Numbermatics.com. 2022. Web. 16 August 2022.

APA style:
Numbermatics. (2022). Number 28821 - Facts about the integer. Retrieved 16 August 2022, from https://numbermatics.com/n/28821/

Chicago style:
Numbermatics. 2022. "Number 28821 - Facts about the integer". https://numbermatics.com/n/28821/

The information we have on file for 28821 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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