The common factors of 27 and 81 are 3, 9 and 27 One is usually included in factors of numbers unless otherwise specified.
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GCD: 27 LCM: 162 All common factors of 81 and 54 are all multiples of their LCM.
The factors of 27 are: 1, 3, 9, 27 The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54 The factors of 81 are: 1, 3, 9, 27, 81
81 has 5 factors: 1, 3, 9, 27, and 81.
The factors of 243 are 1, 3, 9, 27, 81, and 243.
39,39,1,1 (: If you mean multiplication, 1, 3, 9, 27, 81 are all factors of 81.