Any of its factors
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The greatest common factor (GCF) of two numbers is the largest number that divides both numbers evenly. In this case, the GCF of 12 and 144 is 12. The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers. The LCM of 12 and 144 is 144. Therefore, the numbers that have a GCF of 12 and an LCM of 144 are 12 and 144.
These are the numbers that divide into 28 evenly: 1, 2, 4, 7, 14, 28.
The greatest common factor of these numbers is 1. If it were a composite number, we could say that that number, and all the numbers that divide it evenly, divide these numbers evenly. However, these numbers are relatively prime-that is, the only factor they share is 1.
10 can be divided evenly into 2 and 5, which are the factors of 10.
factors of 540 are 1,2,3,4,5,6,9,10,12,15,18,20,27,30,36,45,54,60,90,108,135,180,270,540