I assume these are sides of a box. When you multiply the numbers together, you get 4x8x1 = 32. When you multiply the ft, you get ft x ft x ft, or ft^3, which is cubic feet.
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1 cubic ft = 1 ft * 1 ft * 1ft 1 cubic ft = 12 in * 12 in * 12 in 1 cubic ft = 1728 cubic inches
1 cu foot = 1ft * 1 ft * 1 ft = 12 in * 12 in * 12 in = 1728 cubic inches. So 2592 cu inches = 2592/1728 = 1.5 cu ft
5x3x1 = 15ft3.
500 cubic feet
64 cubic feet