90,000,000
or
9.0 x 10^(7)
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90 x 106 or 90,000,000
there are several ways; including 2.5 Million or 2,500,000 or 2.5*10^6
ninety million or as 9.0*107 in scientific notation
You could write it two ways in word form: Two and five tenths (which is usually preferred on math homework) or Two point five.
2,000,000 = two million.