Q: How Many Digits in the Number 646,405,640?

 A: The number 646,405,640 has 9 digits.

How does 646,405,640 have 9 digits?

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


646405640
Digit # 123456789

What are the number of digits of the numbers near 646,405,640?

646,405,638646,405,639646,405,641646,405,642
9999

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