2564863 has 4 divisors (see below), whose sum is σ = 2931280. Its totient is φ = 2198448.

The previous prime is 2564857. The next prime is 2564899. The reversal of 2564863 is 3684652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2564863 - 2⁵ = 2564831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564813) 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, 183198 + ... + 183211.

It is an arithmetic number, because the mean of its divisors is an integer number (732820).

2^2564863 is an apocalyptic number.

2564863 is a deficient number, since it is larger than the sum of its proper divisors (366417).

2564863 is an equidigital number, since it uses as much as digits as its factorization.

2564863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366416.

The product of its digits is 34560, while the sum is 34.

The square root of 2564863 is about 1601.5189664815. The cubic root of 2564863 is about 136.8846419123.

The spelling of 2564863 in words is "two million, five hundred sixty-four thousand, eight hundred sixty-three".