Answer:
Andrew is incorrect.
Explanation:
He is incorrect because instead of multiplying 2 x 28, he should have did 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2, which is 268,435,456.
I tm pretty sure this is correct, please comment if it is right or wrong