$${ 9 }^{ 2 } | { 2 }^{ 2 } { 7 }^{ 2 } { 0 }^{ 2 }$$
$0$
$$81|2^{2}\times 7^{2}\times 0^{2}|$$
$$81|4\times 7^{2}\times 0^{2}|$$
$$81|4\times 49\times 0^{2}|$$
$$81|196\times 0^{2}|$$
$$81|196\times 0|$$
$$81|0|$$
$$81\times 0$$
$$0$$
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