25643568 has 20 divisors (see below), whose sum is σ = 66246008. Its totient is φ = 8547840.

The previous prime is 25643561. The next prime is 25643581. The reversal of 25643568 is 86534652.

It is not an unprimeable number, because it can be changed into a prime (25643561) 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, 267073 + ... + 267168.

Almost surely, 2^25643568 is an apocalyptic number.

It is an amenable number.

25643568 is an abundant number, since it is smaller than the sum of its proper divisors (40602440).

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

25643568 is a wasteful number, since it uses less digits than its factorization.

25643568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534252 (or 534246 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 25643568 is about 5063.9478670302. The cubic root of 25643568 is about 294.8896187628.

The spelling of 25643568 in words is "twenty-five million, six hundred forty-three thousand, five hundred sixty-eight".