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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=utf-8>
  <title>Perfect number single check</title>
</head>
<body>
  <h1>Perfect number check</h1>
  <pre id=out></pre>
  <script>!function(){var t=[];t.push("Input: 28"),t.push(function(t){var n,e=0;for(n=1;n<=Math.floor(t/2);n++)t%n==0&&(e+=n);return e===t}(28)?"28 is a perfect number.":"28 is not a perfect number."),document.getElementById("out").textContent=t.join("\n")}()</script>
</body>
</html>

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JavaScript Perfect Number — Single Check (Try It)