Answer :
64 has seven distinct factors:
1, 2, 4, 8, 16, 32, 64
We can form four pairs from those distinct factors:
(1, 64) because 1 * 64 = 64
(2, 32) because 2 * 32 = 64
(4, 16) because 4 * 16 = 64
(8, 8) because 8 * 8 = 64
1, 2, 4, 8, 16, 32, 64
We can form four pairs from those distinct factors:
(1, 64) because 1 * 64 = 64
(2, 32) because 2 * 32 = 64
(4, 16) because 4 * 16 = 64
(8, 8) because 8 * 8 = 64