The Harmonic Overtone Series

If i play the lowest notes on the piano and then the highest notes, there is something very noticeably different in the quality of the notes. The reason for both of these changes has to do with the harmonic overtone series we have been learning abouts. Our lowest note on the piano vibrates at 27 point five herts - you can acturally tell me what that note is? Just double 27 point five until the number gets familiar, 50, 510. And the lower the note, the more clearly we can hear the overtones, and the more overtones we can hear. This also means hear many more of the notes overtones, not just the octave and the perfect fifth,