Q: How Many Digits in the Number 646,405,639?

 A: The number 646,405,639 has 9 digits.

How does 646,405,639 have 9 digits?

You simply count the number of digits from the first number to the last. Like this:


646405639
Digit # 123456789

What are the number of digits of the numbers near 646,405,639?

646,405,637646,405,638646,405,640646,405,641
9999

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