$$\frac{18}{2}\times\frac{36}{4}\times\frac{72}{8}$$
$729$
$$9\times \frac{36}{4}\times \frac{72}{8}$$
$$9\times 9\times \frac{72}{8}$$
$$81\times \frac{72}{8}$$
$$81\times 9$$
$$729$$
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$3^{6}$
