# 685

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

What does the number 685 look like?

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

685 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 685:

### 5 × 137

See below for interesting mathematical facts about the number 685 from the Numbermatics database.

### Names of 685

• Cardinal: 685 can be written as Six hundred eighty-five.

### Scientific notation

• Scientific notation: 6.85 × 102

### Factors of 685

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 142

### Divisors of 685

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 828
• Sum of proper divisors (its aliquot sum) s(n): 143
• 685 is a deficient number, because the sum of its proper divisors (143) is less than itself. Its deficiency is 542

### Bases of 685

• Binary: 10101011012
• Base-36: J1

### Squares and roots of 685

• 685 squared (6852) is 469225
• 685 cubed (6853) is 321419125
• The square root of 685 is 26.1725046567
• The cube root of 685 is 8.8151598195

### Scales and comparisons

How big is 685?
• 685 seconds is equal to 11 minutes, 25 seconds.
• To count from 1 to 685 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 685 cubic inches would be around 0.7 feet tall.

### Recreational maths with 685

• 685 backwards is 586
• The number of decimal digits it has is: 3
• The sum of 685's digits is 19
• More coming soon!

MLA style:
"Number 685 - Facts about the integer". Numbermatics.com. 2021. Web. 28 November 2021.

APA style:
Numbermatics. (2021). Number 685 - Facts about the integer. Retrieved 28 November 2021, from https://numbermatics.com/n/685/

Chicago style:
Numbermatics. 2021. "Number 685 - Facts about the integer". https://numbermatics.com/n/685/

The information we have on file for 685 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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