27580 is a member of A002858: Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = least number > a(n-1) which is a unique sum of two distinct earlier terms. In this case we have: 27580 = 339 + 27241

27580 is a practical, abundant, pseudoperfect and Zumkeller number.

27580 is an undulating number in base 14 (a0a0).

27580 is a plaindrome in base 16 (6bbc).

27580 can be rendered as a digit equation as follows:

-2 + 7 = 5 * 8 ^ 0