It is more appropiate to use millimeters. Sand ranges in size from 0.06 mm to 2 mm. That is 60000 to 2000000 nanometers.
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a grain of sand
Miligram
well it is about 2.8 or 2.9 if it isn't wet.
It depends on grain size, which can be as small as 0.004 inch or as big as 0.1 inch. If we take an average grain size of 0.02 inch diameter that is 0.00000043 cubic inch volume and a cubic foot is 1728 cubic inches then (not considering packing voids) that is 1728/.000000 = 4 billion grains!
An aspirin tablet is 100 mg. For something of similar density, it would be about the size of a grain of sand. That's pretty big if it is in your eye.