7. Find all positive integers $n$ such that $\varphi(n)=2^{6}$.

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7. $n=2^{7}, 2^{6} \cdot 3, 2^{5} \cdot 5, 2^{4} \cdot 3 \cdot 5 ; 2^{3} \cdot 17, 2^{2} \cdot 3 \cdot 17, 2 \cdot 5 \cdot 17, 5 \cdot 17$.