There is an infinite number of common multiples for 12 and 28. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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28 and 28
GCF(12, 28, 36) = 4, LCM(12, 28, 36) = 252.
The greatest common multiple of any set of integers is infinite.
There is really no such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.
It is: 4