# 639

## 639 is an odd composite number composed of two prime numbers multiplied together.

What does the number 639 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

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

## Prime factorization of 639:

### 32 × 71

(3 × 3 × 71)

See below for interesting mathematical facts about the number 639 from the Numbermatics database.

### Names of 639

• Cardinal: 639 can be written as Six hundred thirty-nine.

### Scientific notation

• Scientific notation: 6.39 × 102

### Factors of 639

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 74

### Divisors of 639

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 936
• Sum of proper divisors (its aliquot sum) s(n): 297
• 639 is a deficient number, because the sum of its proper divisors (297) is less than itself. Its deficiency is 342

### Bases of 639

• Binary: 10011111112
• Base-36: HR

### Squares and roots of 639

• 639 squared (6392) is 408321
• 639 cubed (6393) is 260917119
• The square root of 639 is 25.2784493197
• The cube root of 639 is 8.6132480147

### Scales and comparisons

How big is 639?
• 639 seconds is equal to 10 minutes, 39 seconds.
• To count from 1 to 639 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 639 cubic inches would be around 0.7 feet tall.

### Recreational maths with 639

• 639 backwards is 936
• The number of decimal digits it has is: 3
• The sum of 639's digits is 18
• More coming soon!

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"Number 639 - Facts about the integer". Numbermatics.com. 2023. Web. 28 January 2023.

APA style:
Numbermatics. (2023). Number 639 - Facts about the integer. Retrieved 28 January 2023, from https://numbermatics.com/n/639/

Chicago style:
Numbermatics. 2023. "Number 639 - Facts about the integer". https://numbermatics.com/n/639/

The information we have on file for 639 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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