2563664 has 20 divisors (see below), whose sum is σ = 5002656. Its totient is φ = 1272672.

The previous prime is 2563661. The next prime is 2563667. The reversal of 2563664 is 4663652.

It is an interprime number because it is at equal distance from previous prime (2563661) and next prime (2563667).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2563664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117 + ... + 3099.

2^2563664 is an apocalyptic number.

It is an amenable number.

2563664 is a deficient number, since it is larger than the sum of its proper divisors (2438992).

2563664 is a wasteful number, since it uses less digits than its factorization.

2563664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1148 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 2563664 is about 1601.1445905976. The cubic root of 2563664 is about 136.8633087044.

The spelling of 2563664 in words is "two million, five hundred sixty-three thousand, six hundred sixty-four".