25643516 has 12 divisors (see below), whose sum is σ = 46089288. Its totient is φ = 12475152.

The previous prime is 25643507. The next prime is 25643533. The reversal of 25643516 is 61534652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86486 + ... + 86781.

It is an arithmetic number, because the mean of its divisors is an integer number (3840774).

Almost surely, 2^25643516 is an apocalyptic number.

It is an amenable number.

25643516 is a deficient number, since it is larger than the sum of its proper divisors (20445772).

25643516 is a wasteful number, since it uses less digits than its factorization.

25643516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173308 (or 173306 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 25643516 is about 5063.9427326936. The cubic root of 25643516 is about 294.8894194370.

The spelling of 25643516 in words is "twenty-five million, six hundred forty-three thousand, five hundred sixteen".