1, 2, 3, 4, 6, 12.
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The GCF of 60, 120, and 144 is 12.
It is 12
LCM(60, 18, 24) = 144.
144 is a number that is divisible by the value of its φ function, which returns 48 in this case. Also, there are 21 solutions to the equation φ(x) = 144, more than any integer below 144, making it a highly totient number
12