Not sure why he should be, when Archangels are only the second of the (IIRC) six different ranks of angels.
Let's see if I can remember them all, as close to in order as I can manage: angels, archangels, dominions, thrones, cherubim, seraphim
(Of course, this, too, depends on which particular branch of Christianity you listen to.)
There are a few different hierarchies, again most were formulated in the middle ages. The most influential is arguably "The Celestial Hierarchy" which formed 3 spheres of 3 choirs, or types of angel in each sphere. In addition to the ones you listed there are also the Principalities, Powers and Virtues.
It is important to differentiate between archangels (second lowest category, of the third sphere whom's responsibility was warriors and messengers and the Archangels, which according to some interpretations where the seven highest Seraphim and thus the highest of all the choirs. Since the Seraphim's are often portrayed as caretakers of Gods throne chanting "Holy Holy is the Lord of the hosts and burning with love for God, and in many traditions it is the requirement of continual adulation for God that drove Satan to rebel, it is common to place Satan and his "rival" Michael as seraphim.
Anyway very little exists in the bible about any of the hierarchies, so they are at best a interpretation of limited data.
