The LCM is 1323.
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The LCM of 27 and 63 is 189. The LCM of 81 and 441 is 3969. The LCM of all four is 3969.
GCF(189, 441, 63) = 21.
The GCF is: 63
63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, 756, 819, 882, 945, . . . forever
The factors of 441 are: 1 3 7 9 21 49 63 147 441 The prime factors are: 3, 7