The factors of 27 are 27, 9, 3 and 1
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GCD: 27 LCM: 162 All common factors of 81 and 54 are all multiples of their LCM.
The common factors of 27 and 81 are 3, 9 and 27 One is usually included in factors of numbers unless otherwise specified.
The common factors of 27 and 36 are 1, 3 and 9.
The common factors of 27 and 39 are 1 and 3
The factors of 27 are 1,3,9, and 27 The factors of 64 are 1,2,4,8,16,32, and 64. 1 is the only common factor of 27 and 64.