[vincent-manis]

I tried "4765" (four syllables), and got "sixty-nine squared plus four" (6 syllables).

The ICAO phonetic alphabet specifically pronounces "4" as "fouwer", and "9" as "niner", so as to increase redundancy on a noisy channel.

[moeffju]

You got "four thou-sand se-ven hun-dred six-ty-five" :)

[vincent-manis]

Nope, I got "four seven six five", which is exactly how I would read that number if it were a street address, or a phone extension, or an inumber, or the like. You will notice that the site doesn't give any context about the usage of these numbers.