1,000,000
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1 and one half billion can be written as 1.5 billion.
Ten billion is written as 1 followed by 10 zeros; 10,000,000,000
3.2 billion is written as 3,200,000,000.
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).
1 billion short scale = 109 or 1 billion long scale 1012 1 billion x 1 billion = short scale 1018 1 billion x 1 billion = long scale 1024 109 = 1 billion short scale and 1 milliard long scale. 1012 = 1 trillion short scale and 1billion long scale. 1015 = 1 quadrillion short scale and 1 billiard long scale. 1018 = 1 quintillion short scale and 1 trillion long scale. 1024 = 1 quadrillion short scale and 1 septillion long scale.