To write 2.77 billion in number form, you would express it as 2,770,000,000. This is done by placing the digits in the appropriate positions, with 2 followed by 9 zeros, and adding the decimal portion for the fractional part.
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19.35 billion = 19,350,000,000
As a number: 7,125,000,000 = 7.125 billion
As a number it is: 24,600,000,000 = 24.6 billion
As a number it is: 1,800,000,000 = 1.8 billion
As number it is: 1,500,000,000