2561604 has 12 divisors (see below), whose sum is σ = 5977104. Its totient is φ = 853864.

The previous prime is 2561593. The next prime is 2561627. The reversal of 2561604 is 4061652.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106722 + ... + 106745.

It is an arithmetic number, because the mean of its divisors is an integer number (498092).

2^2561604 is an apocalyptic number.

It is an amenable number.

2561604 is an abundant number, since it is smaller than the sum of its proper divisors (3415500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561604 is a wasteful number, since it uses less digits than its factorization.

2561604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213474 (or 213472 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2561604 is about 1600.5011715085. The cubic root of 2561604 is about 136.8266406172.

The spelling of 2561604 in words is "two million, five hundred sixty-one thousand, six hundred four".