As a number it is: 7,000,000,000
one billion has nine zeros, so seven billion would be:7,000,000,000
to write seven billion in roman numerals you have to put 7000000000
The standard (numeral) form is 27,490,000,008
3,000,780,439
5.9 billion = 5,900,000,000
1,000,000,000 = 1 billion.
5,000,000,000
30,607,016,041
300,000,780,439
2.3 billion is written: 2,300,000,000
The number 1 billion can be written as the Roman numeral [M] with a horizontal bar above it (which I can't write with my keyboard).
2000000000