Playing with numbers

The mystery number

Find the 10 digit number according to these rules:

:

The units' digit is the number of times that 9 appears in the number.

The tens' digit is the number of times that 8 appears in the number.

The hundreds' digit is the number of times that 7 appears in the number.

The thousands' digit is the number of times that 6 appears in the number etc.