0
Anonymous
6
(-7)x(-4)
(7)x(4)
(1)x(28)
(-1)x(-28)
(2)x(14)
(-2)x(-14)
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1 and 28, 2 and 14, 4 and 7.
One pair: it's a prime number.
Eight of them.
Two of them.
Three of them.