Confusing Problem

Write your question accurately !!  How many what? 4-digit, 5-digit, 6-digit numbers? And is divisible by what number?

Sorry, I meant to write how many 10 digit numbers are there, such of the digits is divisible by 5? The digits can be repeated.

Do you want the SUM of the 10-digit number to be divisible by 5? Example:1234567890=45 which is divisible by 5.

Yes, I'm so sorry for the confusion.

This is an arithmetic sequence as follows:

N/2 * [2*1000000004 + 5*(N - 1)] =9900000002700000000, solve for N

N =1,800,000,000 - 10-digit numbers that are divisible by 5.

Thank you so much!