Highly composite interval
A highly composite interval or highly composite harmonic is a harmonic which as a ratio of frequencies is a highly composite number; that is, a number such as 1, 2, 4, 6, 12, … each of which has more divisors than the number before it.
Highly composite intervals are significant for having the largest number of ways to be approached through harmonic chords for its size.
The opposite of a highly composite harmonic is a prime harmonic.