104 (number)

104 is the natural number following 103 and preceding 105.

In mathematics

104 is a refactorable number and a primitive semiperfect number.
The smallest known 4-regular matchstick graph has 104 edges and 52 vertices, where four unit line segments intersect at every vertex.
The second largest sporadic group has a McKay–Thompson series, representative of a principal modular function is, with constant term :
The Tits group, which is the only finite simple group to classify as either a non-strict group of Lie type or sporadic group, holds a minimal faithful complex representation in 104 dimensions.