That would provide a surface area of some 7,070,000 square microns.
According to this site, the upper-end of amoebic girth is some 30 microns diameter: Diameter of a Protozoan <hypertextbook.com>
Thus allowing the amorphous little bugger comfortable residence in an area of some 707 square microns.
That would get you about ten thousand amoebae on the head of a pin... something on that order of magnitude, anyway.
If I've miscalculated, I'm sure some SITO brainiac will let me know.
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