Subtracting from 2604 its product of nonzero digits (48), we obtain a triangular number (2556 = T71).
Adding to 2604 its reverse (4062), we get a palindrome (6666).
2604 is nontrivially palindromic in base 5.
2604 is an undulating number in base 5.
It is a nialpdrome in base 14.
It is a self number, because there is not a number n which added to its sum of digits gives 2604.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2604.
22604 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3584).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2604 is a wasteful number, since it uses less digits than its factorization.
2604 is an odious number, because the sum of its binary digits is odd.
The square root of 2604 is about 51.0294032887. The cubic root of 2604 is about 13.7577366928.
The spelling of 2604 in words is "two thousand, six hundred four".