25857564 has 24 divisors (see below), whose sum is σ = 60871440. Its totient is φ = 8542464.

The previous prime is 25857563. The next prime is 25857583. The reversal of 25857564 is 46575852.

It is a super-2 number, since 2×25857564² = 1337227232028192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25857563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8179 + ... + 10890.

It is an arithmetic number, because the mean of its divisors is an integer number (2536310).

Almost surely, 2^25857564 is an apocalyptic number.

It is an amenable number.

25857564 is an abundant number, since it is smaller than the sum of its proper divisors (35013876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25857564 is a wasteful number, since it uses less digits than its factorization.

25857564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19189 (or 19187 counting only the distinct ones).

The product of its digits is 336000, while the sum is 42.

The square root of 25857564 is about 5085.0333332241. The cubic root of 25857564 is about 295.7076337675.

The spelling of 25857564 in words is "twenty-five million, eight hundred fifty-seven thousand, five hundred sixty-four".