In the more common American-based system, 1.5 billion is written 1,500,000,000.
In the Commonwealth system, popular throughout continental Europe and in olden times, in the United Kingdom, 1.5 billion is written 1,500,000,000,000.
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3.2 billion is written as 3,200,000,000.
15 billion = 1.5 x 10^10 or 1.5e+10
As a number it is: 3,090,000,000 = 3.09 billion
It is: 1,400,000,000 = 1.4 billion
3.4 billion can be written in number format as 3,400,000,000.