Numbers in a Number

$M$ is a 7-digit number such that

(i) the first digit of $M$ is the number of 0's in $M$

(ii) the second digit of $M$ is the number of 1's in $M$

(iii) the third digit of $M$ is the number of 2's in $M$

and so on until the last digit of $M$ is the number of 6's in $M$

Find $M$ .