That would depend upon the other number(s) with which the factors are common.
The factors of 50 are 1, 2, 5, 10, 25 & 50, so the common factors of 50 will be 1 or more of these dependent upon the other number(s).
For example:
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The common factors of 40 and 50 are: 1, 2, 5, and 10
The common factors of 35 and 50 are 1 and 5. factors of 35: 1, 5, 7, 35 factors of 50: 1, 2, 5, 10, 25, 50
There is neither a greatest common factor nor common factors of a single number, such as 50, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor. The factors of 50 are 1, 2, 5, 10, 25, and 50. The prime factors of 50 are 2, 5, and 5, or in exponential form, 2 and 52. Examples: The greatest common factor of 20 and 50 is 10. The common factors are 1, 2, 5, and 10. The greatest common factor of 44 and 50 is 2. The common factors are 1 and 2. The greatest common factor of 50 and 115 is 5. The common factors are 1 and 5. The greatest common factor of 50, 75, and 625 is 25. The common factors are 1, 5, and 25.
The factors of 30 are: 1 2 3 5 6 10 15 30. The factors of 50 are: 1 2 5 10 25 50. The common factors of 30 and 50 are: 1 2 5 10. The greatest common factor of 30 and 50 is: 10.
The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 50 are 1, 2, 5, 10, 25, and 50. The common factors of 20 and 50 are 1, 2, 5, and 10. Therefore, the least common factor (the smallest common factor) is 1.