25643864 has 16 divisors (see below), whose sum is σ = 48139920. Its totient is φ = 12806560.

The previous prime is 25643833. The next prime is 25643869. The reversal of 25643864 is 46834652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643869) 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, 8474 + ... + 11094.

It is an arithmetic number, because the mean of its divisors is an integer number (3008745).

Almost surely, 2^25643864 is an apocalyptic number.

It is an amenable number.

25643864 is a deficient number, since it is larger than the sum of its proper divisors (22496056).

25643864 is a wasteful number, since it uses less digits than its factorization.

25643864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850 (or 3846 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 25643864 is about 5063.9770931551. The cubic root of 25643864 is about 294.8907533812.

The spelling of 25643864 in words is "twenty-five million, six hundred forty-three thousand, eight hundred sixty-four".