987654
9,999,876 is the greatest seven-digit number using four different digits.
greatest number9999987
98765.
98
That would be 99987.
9,999,876 is the greatest seven-digit number using four different digits.
greatest number9999987
8642
9,876,543 is.
98765.
98
That would be 99987.
999987
9876 and 1234
99,999,876
99,999,987
In order to make the number as big as possible, you would want the greatest value digits in the greatest place value. Thus the first number would have to be 9. Once 9 has been used, the second number would have to be 8. Then the third number would have to be 7 and so on. Therefore, the greatest 9 digit number with 9 different digits is 987,654,321.