A Perfect Lesson

Cameron just got done teaching me that a "perfect number is a number that is equal to the sum of its positive divisors." What 3rd grader knows that?! What grade schooler even understands that?!

Now, he and Michael are looking up different types of numbers on Wikipedia: perfect numbers, abundant numbers (sum of divisors is greater than two times the number), semi-perfect number (a positive integer that is equal to the sum of all or some of its proper divisors), super perfect number . . . and so on.