Hello,

I hope this roll number of yours is for NEET 2020 exam.

There are basically 2 options for you to do this.

One, you can write each number in words separated by commas.

Example: 345 as three,four,five.

Second, write the number in Hindu Arabic system.

Example: 784369 as seven lakh eighty four thousand three hundred and sixty nine.

Hope this helps.

Thanks.