LCM factoring
512=2*2*2*2*2*2*2*2*2
648=2*2*2*2*3*3*3*3
lcm=2*2*2*2*2*2*2*2*2*3*3*3*3=41,472
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They are all the numbers in the set {41472*k, where k is an integer}.
The LCM is 648.
The LCM of 81 and 216 is 648.
LCM is 648, which is the multiple of the highest power of prime factors in the given numbers (23 x 34).
How about: 8*81 = 648 or 2*324 = 648 out of many possibilities