# 638

## 638 is an even composite number composed of three prime numbers multiplied together.

What does the number 638 look like?

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

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

## Prime factorization of 638:

### 2 × 11 × 29

See below for interesting mathematical facts about the number 638 from the Numbermatics database.

### Names of 638

• Cardinal: 638 can be written as Six hundred thirty-eight.

### Scientific notation

• Scientific notation: 6.38 × 102

### Factors of 638

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 42

### Divisors of 638

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 1080
• Sum of proper divisors (its aliquot sum) s(n): 442
• 638 is a deficient number, because the sum of its proper divisors (442) is less than itself. Its deficiency is 196

### Bases of 638

• Binary: 10011111102
• Base-36: HQ

### Squares and roots of 638

• 638 squared (6382) is 407044
• 638 cubed (6383) is 259694072
• The square root of 638 is 25.2586618805
• The cube root of 638 is 8.6087525819

### Scales and comparisons

How big is 638?
• 638 seconds is equal to 10 minutes, 38 seconds.
• To count from 1 to 638 would take you about five minutes.

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 638 cubic inches would be around 0.7 feet tall.

### Recreational maths with 638

• 638 backwards is 836
• The number of decimal digits it has is: 3
• The sum of 638's digits is 17
• More coming soon!

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"Number 638 - Facts about the integer". Numbermatics.com. 2023. Web. 28 March 2023.

APA style:
Numbermatics. (2023). Number 638 - Facts about the integer. Retrieved 28 March 2023, from https://numbermatics.com/n/638/

Chicago style:
Numbermatics. 2023. "Number 638 - Facts about the integer". https://numbermatics.com/n/638/

The information we have on file for 638 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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