27404 is a member of OEIS A096399: numbers k such that both k and k+1 are abundant. The sequence begins:

5775, 5984, 7424, 11024, 21735, 21944, 26144, 27404, 39375, 43064, 49664, 56924, 58695, 61424, 69615, 70784, 76544, 77175, 79695, 81080, 81675, 82004, 84524, 84644, 89775, 91664, 98175, 103455, 104895, 106784, 109395, 111824, 116655, ...

See blog posts Gaps Between Deficient Numbers and Abundant Numbers.

27404 is a Harshad, primitive abundant, pseudoperfect and Zumkeller number.

27404 can be converted to a digit equation as follows:

-2 + 7 - 4^0 = 4

27404 stabilises under Conway's Game of Life rules after about 195 generations to a single blinker and an assortment of still life shapes.