Friday

July 25, 2014

July 25, 2014

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

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.

**Related Questions**

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 - 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 ...

Algebra 1 - What is the first natural number that is a perfect square and a ...

Math - Which numbers are perfect squares? A) 64 b)900 c)120 d)1000 e)100 F) 10 ...

math - The number 1 is a perfect square (1X1=1) and a perfect cube (1X1X1=1). ...

Algebra - what is a perfect square number i know 9, 25 and 100, but what else if...

math - the only perfect number of the form (x to the power of n) + (y to the ...

math - How many perfect squares are less than or equal to 36? how many less than...