$${ 2 }^{ 2 } \times { 6 }^{ 2 } \times { 7 }^{ 2 } \times { 9 }^{ 2 }$$
$571536$
$$4\times 6^{2}\times 7^{2}\times 9^{2}$$
$$4\times 36\times 7^{2}\times 9^{2}$$
$$144\times 7^{2}\times 9^{2}$$
$$144\times 49\times 9^{2}$$
$$7056\times 9^{2}$$
$$7056\times 81$$
$$571536$$
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$2^{4}\times 3^{6}\times 7^{2}$
