Test If a Number Is Perfect

Ever wondered if a number is perfect or not? Test If a Number Is Perfect gives you a fast way to check. Just paste in some numbers, and the tool will tell you whether each one qualifies as a perfect number. It even explains why showing the divisor sum behind the verdict.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .log
Total items: 0
Options
Show divisor sum explanation
Trim whitespace
Ignore invalid entries

How to Use:

  1. Paste numbers into the Input Numbers box (one per line).
  2. Or import a .txt, .csv, or .log file with numbers.
  3. Use the toggles in the Options box to customize:
    • Show explanation
    • Trim whitespace
    • Ignore invalid input
  4. The tool updates the output live with each change.
  5. Use Copy Output or Export to File to save results.
  6. Click Clear All to reset everything.

What Test If a Number Is Perfect can do:

It checks each number and determines if it’s a perfect number one where the sum of proper divisors equals the number itself. If “Show divisor sum explanation” is on, it shows the calculation right next to each result.

You can clean up your input automatically with the trim toggle, or skip bad lines using the ignore invalid entries toggle. The tool also tracks how many results were processed.

By default, it explains why each number is or isn’t perfect using divisor sums. But you can keep it cleaner by turning that off.

Example:

Input:

6
10
28
123

Output:

6 → Perfect (Sum of divisors = 6)
10 → Not perfect (Sum of divisors = 8)
28 → Perfect (Sum of divisors = 28)
123 → Not perfect (Sum of divisors = 69)

Common Use Cases:

This tool’s handy when you’re exploring number theory or checking sequences for perfect numbers. Whether you’re a teacher, student, or just curious, it’s a quick way to test large sets of numbers, copy the results, and tweak the logic with live controls.

Useful Tools & Suggestions:

If you’re testing for perfection, it’s worth checking the extremes too Test If a Number Is Deficient shows when the divisors don’t quite add up. And for a full spectrum, Generate Abundant Number Sequence lets you explore numbers that go beyond perfect.

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