Option (1): 6
The proper divisors of 6 are 1, 2, and 3.
Sum of proper divisors = 1 + 2 + 3 = 6
Since the sum equals the number, 6 is a Perfect Number.
Option (2): 28
The proper divisors of 28 are 1, 2, 4, 7, and 14.
Sum of proper divisors = 1 + 2 + 4 + 7 + 14 = 28
Since the sum equals the number, 28 is a Perfect Number.
Option (3): 128
The proper divisors of 128 are 1, 2, 4, 8, 16, 32, and 64.
Sum of proper divisors = 1 + 2 + 4 + 8 + 16 + 32 + 64 = 127
Since 127 is not equal to 128, 128 is not a Perfect Number.
Option (4): 496
The proper divisors of 496 are 1, 2, 4, 8, 16, 31, 62, 124, and 248.
Sum of proper divisors = 1 + 2 + 4 + 8 + 16 + 31 + 62 + 124 + 248 = 496
Since the sum equals the number, 496 is a Perfect Number.
Therefore, the different number is 128.
Hence, the correct answer is βOption 3β.