One billion (109 ).
1,073,741,824 (230 ).
One billion; the factor 109
A prefix that means.
One billion (109 ), as in gigahertz, one billion hertz.
230 (that is, 1,073,741,824), which is the power of 2 closest to a billion, as in gigabyte.
(computing) Multiplying the unit to which it is attached by 230 or 1,073,741,824