Ten digits.
9 digits
250 million = 250,000,000. There are 9 digits in this number.
Eight Digits: 30,000,000
100,000,000 = nine digits.
7 digits.
There are 8 digits in 65,600,000
A million is one number. If you refer to the digits, a million has seven digits. "Millions" can have seven digits or more.
200,000,000 9 digits.
Four digits: 10 billion million = (10)15
500 000, there is 6 digits!
7.