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673 divides 3333333331. It is the second number of the form (3)w1 to be found composite after many mathematicians thought all numbers of that form were prime.

The Louvre Pyramid is made up of 673 glass lozenges and triangles, not counting the doors.

Chlorophyll a fluoresces at 673 nanometers.

The smallest prime adjacent to any 3-perfect number. [Loungrides]

673 = 1(mod 6) = 1(mod 7)= 1(mod3). [Bergot]

There are 673 numbers N with no two same digits, having the property that when the sum of the k leftmost digits of N is divided by k the result is always an integer. [Post and Dale]