Answer:
Four hundred and twenty three billion, ninety million and seven hundred and nine thousand.
Explanation:
In this case we have "four" hundred billion. Then, the rest are twenty three billion and the rest is ninety million and then, you have seventy nine thousand. However you should write the whole number like this:
"Four hundred and twenty three billion, ninety million and seven hundred and nine thousand."
- 100,000,000,000 - Hundred billion.
- 100,000,000 - Hundred million.
- 100,000 - Hundred thousand.
- 1,000 - Thousand.