Posted by **Jasmine20** on Thursday, December 7, 2006 at 1:37am.

How is 28 a perfect number? Can someone explain this to me.

all i understand that all perfect numbers end in 6 and 8. But how and why is 28 a perfect number.

dimes are packaged 50 in a roll. quarters come 40 in a roll.susan b anthony dollars come in rolls of 25. how many rolls of each do you need to have an equal number of each coin

fulij

your answer has nothing to do towards what i'm asking

fulij please use the Post a New Question choice at the top of the page

28 is a perfect number because its proper divisors are 1, 2, 4, 7, and 14.

So 1 + 2 + 4 + 7 + 14 = 28.

Oh, and for a number to be a perfect number, it's proper divisors must add up to the original number. Just like I showed you about with 28. Another example is the number six. It's proper divisors are 1, 2, and 3. So 1 + 2 + 3 = 6.

Thank you I will study of from what you explained to me.

## Answer This Question

## Related Questions

- math - A number is called a perfect number if it equals the sum of all its ...
- math - a number is called a perfect number if it equals the sum of all its ...
- Math - the only perfect number of the form x(n) + y(n) A perfect number is an ...
- algebra - A number, greater than or equal to 2, is called product-perfect if it ...
- math - The number 1 is a perfect square (1X1=1) and a perfect cube (1X1X1=1). ...
- Algebra 1 - What is the first natural number that is a perfect square and a ...
- Algebra - what is a perfect square number i know 9, 25 and 100, but what else if...
- Math - Which numbers are perfect squares? A) 64 b)900 c)120 d)1000 e)100 F) 10 ...
- math - the only perfect number of the form (x to the power of n) + (y to the ...
- math - The number 1 is a perfect square and a perfict cube. What is the next ...

More Related Questions