assuming you're just talking about fluid, there are 2 and 1/3 fifths in a half gallon. a fifth is 750 ml, where a half gallon in 1.75L or, 1750ml, in regard to spirits. This isn't a true half gallon though, it's actually about 5 fluid ounces short, but American metrics say close enough.
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5 (five)
7.5
There are 2.5 of them.
There are two quarts in a half gallon.
There are 16 cups in a gallon and half a gallon is equal to 8 cups.