Q: How Many Digits in the Number 644,401,520?

 A: The number 644,401,520 has 9 digits.

How does 644,401,520 have 9 digits?

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


644401520
Digit # 123456789

What are the number of digits of the numbers near 644,401,520?

644,401,518644,401,519644,401,521644,401,522
9999

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