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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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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.
Is 28 a perfect abundant or deficient number?
it is perfect i believe the factors are 1,2,4,7,and 14
What am I if I am a two digit number between 10 and 40 and the sum of all my divisors?
15
How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
What are the perfect numbers between 1 and 30?
The two perfect numbers between 1 and 30 are: 6, 28
