45:54:64:80
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| Harmonics | 45:54:64:80 |
| Subharmonics | 1/(192:160:135:108) |
| Intervals from root | 1/1 – 6/5 – 64/45 – 16/9 |
| Cents from root | 0¢ 316¢ 610¢ 996¢ |
| Step intervals | 6/5, 32/27, 5/4 |
| Step cents | 316¢, 294¢, 386¢ |
| Prime limit | 5 |
| Genus | 33 ⋅ 5 (135) |
| Intervallic odd limit | 45 |
| Otonal odd limit | 45 |
| Utonal odd limit | 135 |
45:54:64:80 is a half-diminished seventh chord found on viiø7 (15⁄8) in Ptolemy's intense diatonic scale (Zarlino), perhaps the most common 5-limit diatonic. It is also found on Vø7 (3⁄2) in the duodene.