The first digit from the left, you have = 8 choices.
The 2nd, 3rd, 4th, 5th and 6th from the left, you have =10 x 10 x 10 x 10 x 10 =10^5 choices
The 7th and last digit from the left = 9 choices
So, the total number of integers =8 x 10^5 x 9 =7,200,000 such numbers.
