Factors of 685
The factors of 685 are 1, 5, 137, and 685. In total, 685 has 4 factors. Its prime factorization is 5 × 137, and the sum of all its factors is 828.
All factors of 685
Here are all 4 factors of 685, listed from smallest to largest.
Factor pairs of 685
These 2 pairs of whole numbers each multiply to give 685.
Prime factorization of 685
Dividing 685 by the smallest prime at each step gives its prime factorization:
The distinct prime factors of 685 are 5, 137. To factorize any other number, use the prime factorization calculator.
Factor tree of 685
A factor tree shows the same prime factorization visually. Each composite branch splits until every endpoint is a prime number.
Properties of 685
| Number of factors | 4 |
|---|---|
| Sum of factors | 828 |
| Sum of proper factors | 143 |
| Prime factorization | 5 × 137 |
| Prime or composite? | Composite |
| Even or odd? | Odd |
| Perfect square? | No |
| Perfect cube? | No |
| Classification | Deficient |
What makes 685 interesting
- 685 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 2 different ways.
- 685 is a deficient number: its proper factors sum to 143, which is 542 less than 685 itself.
How to find the factors of 685 yourself
Divide 685 by each whole number starting from 1. Whenever the division leaves no remainder, both the divisor and the quotient are factors. You only need to test up to √685 ≈ 26.17, because every factor above that pairs with one below it.
Reading both columns gives every factor: 1, 5, 137, 685. The factor calculator does this automatically for any number.
Related numbers
Numbers mathematically connected to 685.
Frequently asked questions about 685
What are the factors of 685?
Is 685 a prime number?
What is the prime factorization of 685?
What two numbers multiply to give 685?
What is the sum of the factors of 685?
Is 685 a perfect square?
What is the largest factor of 685 other than itself?
How many factors does 685 have?
Explore more
Try another number in the factor calculator, break 685 down further with the prime factorization calculator, or compare 685 with another number using the GCF calculator and LCM calculator. For divisor counts and sums, see the divisor calculator.