We need to find the odd number out from the given series:
396, 462, 572, 427, 671, 264.
Upon inspecting the numbers, let’s look at the sums of the digits of each number:
From the sums, we notice that all numbers except 427 have sums that are divisible by 2 (i.e., even sums), while 427 has an odd sum of 13.
Thus, the number that does not follow the pattern is 427.
Thus, the correct answer is: 427.