It is: 360
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The least common multiple of the numbers 27, 45 and 72 is 1,080.
72
The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 40 and 65 is 520.
LCM = 72
There is no greatest common multiple. Whatever value you may come up with, I can always add their lowest common multiple (72) to get a higher common multiple.