To write out 4.4 billion, you would start with the number 4, followed by the word "billion." In numerical form, it is written as 4,400,000,000. This is because each billion consists of 1,000 million, so 4.4 billion is equivalent to 4,400 million.
44,000,000,000
86,044,000,072
83,063,044,128
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
The number 4.44 x 10^10 in standard form is 44,000,000,000 or 44 billion.
You write 3.56 billion as 3,560,000,000.
40,300,000,000
$14.7 Billion USD in 2013
As a number it is: 1,800,000,000 = 1.8 billion
Since you asked how I would write the number, the answer is 1031.
1,000 billion billion is: 1,000,000,000,000,000,000,000