27478 is a member of OEIS A064799: numbers that are the sum of the n-th composite and n-th prime numbers, here 27478 = 3149 + 24329 where n=2702. See Bespoken for Sequences entry.

27478 is an alternating and sphenic number.

27478 can be rendered as a digit equation as follows:

-2 + 7 = 4 - 7 + 8