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@ 2013-03-13T14:54:40Z

<?php
$z="printf";
function x($n) {
    for($i = 1; $i <= $n; $i++) {
    	$n % $i == 0 && $i != $n ? $f[]=$i & z("$i "): 0;
    }
array_sum($f) == $n ? z('P') : z('I');
}

x(28);

Output
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VLD
References
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array_sum: documentation ( source)

preferences:dark modelive preview

34.72 ms | 402 KiB | 5 Q