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How is 28 the perfect number?

Updated: 4/28/2022
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11y ago

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First of all, to know if a number is abundant, deficient, or perfect, you need to know all the factors of your given number. The factors of 28 are 1,2,4,7,14, and 28. Add your proper factors -or the factors except itself- and determine if the sum of the proper factors is below (deficient), above (abundant), or the exact same amount (perfect). In this case, if you add the proper factors, it equals exactly 28.

Because it is exact, it is perfect! =)

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Q: How is 28 the perfect number?
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Related questions

Is 28 a perfect number?

Yes it is. 6 is the first perfect number, 28 is the second perfect number.


What is the Perfect number and what is the perfect number after 28?

A perfect number is a number that is the sum of all its proper factors (that is all its factors excluding itself). The next perfect number after 28 is 496


Why is 28 a perfect number?

A number is perfect if all it's factors (barring itself) sum to make the original number. In this case, the factors of 28 are 1,2,4,7 and 14. Added up, these equal 28. Thus, 28 is a perfect number.


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The next perfect number after 11 is 28.


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22 is not a perfect number but 6, 28, 496 and 8128 are perfect numbers.


Is the number 42 a perfect number?

No, it is not a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.


How is 20 a perfect number?

It isn't a perfect number.A perfect number is a number which is the sum of its proper divisors (including 1, but excluding itself).The divisors of 20 are 1, 2, 4, 5, 10.1 + 2 + 4 + 5 + 10 = 22 => 20 is not a perfect number.An example of a perfect number is 28:The divisors of 28 are 1, 2, 4, 7, 141 + 2 + 4 + 7 + 14 = 28 => 28 is a perfect number.


What is the next perfect number after 6?

The second perfect number after 6 is 28. The sum of the factors of 28, excluding itself, is 1 + 2 + 4 + 7 + 14 = 28.