The factors of 78: 1, 2, 3, 6, 13, 26, 39, 78.
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Abundant is a number for which the sum of all its proper factors is greater than the number itself. Deficient is a number for which the sum of all its proper factors is less than the number itself. Perfect is a number for which the sum of all its proper factors is the number itself.
Yes. 1 and the number itself are factors of all numbers.
The only number that has 2 factors is the number 2.
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