2564404 has 6 divisors (see below), whose sum is σ = 4487714. Its totient is φ = 1282200.

The previous prime is 2564381. The next prime is 2564407. The reversal of 2564404 is 4044652.

It can be written as a sum of positive squares in only one way, i.e., 2396304 + 168100 = 1548^2 + 410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320547 + ... + 320554.

2^2564404 is an apocalyptic number.

It is an amenable number.

2564404 is a deficient number, since it is larger than the sum of its proper divisors (1923310).

2564404 is a wasteful number, since it uses less digits than its factorization.

2564404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641105 (or 641103 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 2564404 is about 1601.3756586136. The cubic root of 2564404 is about 136.8764759402.

The spelling of 2564404 in words is "two million, five hundred sixty-four thousand, four hundred four".