The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
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It is: 3240
3240
3240
25 (2x2x2x2x2) = 3242 (4x4) = 1632/16 = 22
72 x 7216 x 3242 x 259224 x 21612 x 43264 x 8154 x 9648 x 10836 x 144