6,290,000,000
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629 in Roman Numerals is DCXXIX :- D (500) + C(100) + XX(2 x 10) + IX(10-1) = 629
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
It is already in Hindu-Arabic numerals