Number of Odd Divisors

How many odd divisors does the number ( 7 4 × 1 6 244 ) (7^{4} \times 16^{244}) has?


The answer is 5.

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1 solution

Observe that the odd divisors can only be of the form 7 n 7^{n} for some non-negative integer n n . Hence, the answer is 5.

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