Answer
The $3$ represents tens of thousands hence $30,000$.
Work Step by Step
The number $3,634,958$ is written in the form of its difference place values.
The $2$ represents millions hence $2,000,000$.
The $6$ represents hundreds of thousands hence $600,000$.
The $3$ represents tens of thousands hence $30,000$.
The $4$ represents thousands hence $4,000$.
The $9$ represents hundreds hence $900$.
The $5$ represents tens hence $50$.
The $8$ represents ones hence $8$.