2564805 has 16 divisors (see below), whose sum is σ = 4132800. Its totient is φ = 1358208.

The previous prime is 2564759. The next prime is 2564813. The reversal of 2564805 is 5084652.

It is not a de Polignac number, because 2564805 - 2⁶ = 2564741 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921 + ... + 2969.

It is an arithmetic number, because the mean of its divisors is an integer number (258300).

2^2564805 is an apocalyptic number.

It is an amenable number.

2564805 is a deficient number, since it is larger than the sum of its proper divisors (1567995).

2564805 is a wasteful number, since it uses less digits than its factorization.

2564805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 2564805 is about 1601.5008585699. The cubic root of 2564805 is about 136.8836101004.

The spelling of 2564805 in words is "two million, five hundred sixty-four thousand, eight hundred five".