Any site where I can input numbers and discover their spell-sound in Chinese?

Hi,

I've been seeing a lot of 6Ns for sale and WTB: 5N, 4N, 3N but do not understand how these numbers are read in Chinese with their PINYIN-translated-to-English meaning.

Can you recommend sites where I can:

1. Input numbers

2. See their Pinyin translation or spell-sound in Chinese

3. See the English translation/meaning of the numbers from the Chinese/Pinyin translation

?

Thanks.

Any site where I can input numbers and discover their spell-sound in Chinese?