$${ 4 }^{ 2 } | { 7 }^{ 2 } { 8 }^{ 2 } { 9 }^{ 2 }$$
$4064256$
$$16|7^{2}\times 8^{2}\times 9^{2}|$$
$$16|49\times 8^{2}\times 9^{2}|$$
$$16|49\times 64\times 9^{2}|$$
$$16|3136\times 9^{2}|$$
$$16|3136\times 81|$$
$$16|254016|$$
$$16\times 254016$$
$$4064256$$
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$2^{10}\times 3^{4}\times 7^{2}$
