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A number that has only one and itself as factors is a prime number and so therefore it can't have four other identical factors.
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.
That's a prime number.
The factors of a number cannot be greater than the number itself. So there are no factors of 4 between 30 and 50.
Any prime number