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As of midyear 2002, the estimated Number of people ever born was 106.5 Billion. (The current world population at that time was estimated at about 6.2 Billion.) See related link (below) Answer Estimates are that between 69 billion and 110 billion people have populated the earth since about one million years ago.
The problem is, how do you calculate how many have ever lived, and where do you start? One group to have done the work is the Population Reference Bureau in Washington. Wendy Baldwin from the Bureau says that the normal starting point is when Homo sapiens first walked the earth, about 50,000 years ago. So you have a starting point and an end figure but it's the time in between that causes the problems. For 99% of that time there is no data, she says.