3.8 billion, written out, is 3,800,000,000 or 3800000000 without the commas.
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You write 38 billion (38,000,000,000) in standard form as 3.8 × 1010
1.52 billion written in numbers is 1,520,000,000
15.8 billion = 15,800,000,000
Six billion = 6,000,000,000
3,900,000,000 is 3.9 billion.