247.\sqrt[3]{3^6 \cdot 2^4 \cdot 5^2}.

$$\sqrt[3]{3^6 \cdot 2^4 \cdot 5^2} = \sqrt[3]{3^6} \cdot \sqrt[3]{2^4} \cdot \sqrt[3]{5^2} = 3^{\frac{6}{3}} \cdot 2^{\frac{4}{3}} \cdot 5^{\frac{2}{3}} = 3^2 \cdot 2^{1+\frac{1}{3}} \cdot 5^{\frac{2}{3}} = 9 \cdot 2 \cdot \sqrt[3]{2} \cdot \sqrt[3]{5^2} = 18\sqrt[3]{2 \cdot 25} = 18\sqrt[3]{50}$$

Ответ: $$18\sqrt[3]{50}$$