In English speaking countries there are 9 zeros in four billion.
4,000,000,000
In other countries there may be 12 zeros in four billion.
4,000,000,000,000
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There are 9 zeros in one billion
A billion is 1 followed by nine zeros 70 billion thus has 10 zeros 70,000,000,000
Seven zeros.
9 zeros
Eight zeros.