As a number it is 1,280,000 = 1.28 million
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20 million is written as 20000000 or 2x107.
A mixed number is a combination of a whole number and a fraction. So 128.34 is the same as 128 34/100 (128 and 34 hundredths), which simplifies to 128 17/50 (128 and 17 fiftieths).
134 = 128 + 4 + 2 = 10000110
17.2 million = 17,200,000
1.28 equals 1 28/100 or 1 7/25 in simplest form.