It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
Greatest common factor of 124 and 152 is 4.
It is: 8
The GCF is 2.
19
The GCF is 8.
The GCF is 19.
It is just 1
The GCF is 4.
The GCF is 4
The GCF is 2.
Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 152, 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 GCF of 38 and 152 is 38.38/38=1152/38=438