That depends on how deep you pour it.
The number of cubic yards you need is
(length of the pad in feet) x (width of the pad in feet) x (depth of the pad in inches)/324
For your 28' x 20' pad, that's [ (1.728) x (depth in inches) ] cubic yards.
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A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.
1 cubic yard of concrete fills 27/depth in feet square feet.
You cannot "fill" a cubic measurement with a square measurement.I think you meant cubic yards.1 cubic yard = 27 cubic feet.Your concrete slab is 1600 x 4/12 cubic feet = 533.333333... cubic feet.533.333333... cubic feet / 27 = 19.753 cubic yards (rounded to third decimal).
A cubic measure ment is required
81 Square feet.