To find 7-digit numbers, we use the steps mentioned earlier in the topic.

Largest 7-digit number: 9999999

Smallest 7-digit number: 1000000

Therefore, the total number of 7-digit numbers are:

\begin{aligned}

&=9999999-1000000\\

&=8999999+1\\

&=9000000

\end{aligned}

There are a total of Ninety Lakh numbers with 7 digits.