There are 7.6 billion people on this earth.

You know how many of those people I consider my friends?

[big]4[/big]

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You missed about 600 million. (You must have edited the title of your post--it didn't always include the 0.6 billion.)

As of December, 2017, global population is estimated at 7.6 billion.

See

https://en.wikipedia.org/wiki/World_population

for details.