2565644 has 6 divisors (see below), whose sum is σ = 4489884. Its totient is φ = 1282820.

The previous prime is 2565643. The next prime is 2565649. The reversal of 2565644 is 4465652.

It is a self number, because there is not a number n which added to its sum of digits gives 2565644.

It is not an unprimeable number, because it can be changed into a prime (2565643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320702 + ... + 320709.

It is an arithmetic number, because the mean of its divisors is an integer number (748314).

2^2565644 is an apocalyptic number.

It is an amenable number.

2565644 is a deficient number, since it is larger than the sum of its proper divisors (1924240).

2565644 is a wasteful number, since it uses less digits than its factorization.

2565644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641415 (or 641413 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 2565644 is about 1601.7627789408. The cubic root of 2565644 is about 136.8985342796.

The spelling of 2565644 in words is "two million, five hundred sixty-five thousand, six hundred forty-four".