The number form for 1600 million is 1.6 billion. This is because one billion is equivalent to one thousand million. Therefore, 1600 million is equal to 1.6 billion when converted to the next higher unit of measurement.
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2.51 million written in number form is 2,510,000
5.31 million in number form is 5,310,000
689 million in number form is 689,000,000
3.42 million in number form is 3,420,000
149.6 million can be written in number form as 149,600,000.