Q: How Many Digits in the Number 644,355,428?

 A: The number 644,355,428 has 9 digits.

How does 644,355,428 have 9 digits?

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


644355428
Digit # 123456789

What are the number of digits of the numbers near 644,355,428?

644,355,426644,355,427644,355,429644,355,430
9999

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