You can write 2,875,000,000 (Two thousand eight hundred seventy-five million) as I just did, or if you are comfortable with scientific notation that would be a much more precise (shorter) way of expressing such a huge number: 2.875 x 10^9.
How To Write Two Thousand Eight Hundred Seventy Five Million?
2,875*1,000,000 = 2,875,000,000