1.28billion
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128
Assuming you mean billion*billion*billion = It is 1*10^27.
If by billion you mean an American billion (109), 1,900,000,000. If you mean a British billion (1012), put 3 more 0s on to the end.
For two numbers, the geometric mean is the sort of their product. Note I use * to mean multiply So here GM= sqrt (128*8) = sqrt (1024) =32
It mean 8.0 * 109 = 8,000,000,000 or 8 billion.