Find the multiple of 640

Let's play "Find the multiple of 640!" This is how it works: There is one number in each of the boxes below, but only one of the numbers is a multiple of 640. Without using a calculator, see if you can find the only multiple of 640.

Find the multiple of 641
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Find the Multiple
Do you want to play "Find the Multiple" for a particular number? If so, please enter it below and press "Play."

Multiples of 640
Do you know that there are more multiples of 640 than there are stars in the universe? Go here to learn all about the multiples of 640.