25864559 has 4 divisors (see below), whose sum is σ = 29559504. Its totient is φ = 22169616.

The previous prime is 25864547. The next prime is 25864561. The reversal of 25864559 is 95546852.

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

It is not a de Polignac number, because 25864559 - 2⁸ = 25864303 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 (25864859) 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, 1847462 + ... + 1847475.

It is an arithmetic number, because the mean of its divisors is an integer number (7389876).

Almost surely, 2^25864559 is an apocalyptic number.

25864559 is a deficient number, since it is larger than the sum of its proper divisors (3694945).

25864559 is an equidigital number, since it uses as much as digits as its factorization.

25864559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694944.

The product of its digits is 432000, while the sum is 44.

The square root of 25864559 is about 5085.7210894818. The cubic root of 25864559 is about 295.7342963513.

The spelling of 25864559 in words is "twenty-five million, eight hundred sixty-four thousand, five hundred fifty-nine".