2, 4, 8
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Proper factors do not include one and the number itself. The only one left is 2.
No, no prime number has proper factors.
24 has eight factors, which means it has six proper factors.
It is 496.496 = 24*31 so its proper factors are 2, 4, 8, 16, 31, 62, 124 and 248. Their sum is 495.
The largest proper factor of 16 is 8, and of 28 is 14. The largest common factor of the pair is 4.