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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Classify deficient perfect abundant</title>
</head>
<body>
  <h1>Classify by proper-divisor sum</h1>
  <p>Edit <code>values</code>, then <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function properDivisorSum(n) {
        if (n < 2) {
          return 0;
        }
        var total = 0;
        var i;
        for (i = 1; i <= Math.floor(n / 2); i++) {
          if (n % i === 0) {
            total += i;
          }
        }
        return total;
      }
      function classify(n) {
        var s = properDivisorSum(n);
        if (s === n) {
          return "perfect";
        }
        if (s < n) {
          return "deficient";
        }
        return "abundant";
      }
      var values = [6, 10, 12, 28, 1];
      var lines = [];
      var i;
      for (i = 0; i < values.length; i++) {
        var value = values[i];
        lines.push(value + ": " + classify(value) + " (s=" + properDivisorSum(value) + ")");
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Perfect Number — Classify Abundance (Try It)