25638265 has 16 divisors (see below), whose sum is σ = 31841280. Its totient is φ = 19805760.

The previous prime is 25638259. The next prime is 25638269. The reversal of 25638265 is 56283652.

It is a happy number.

It is not a de Polignac number, because 25638265 - 2⁹ = 25637753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25638269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17875 + ... + 19255.

It is an arithmetic number, because the mean of its divisors is an integer number (1990080).

Almost surely, 2^25638265 is an apocalyptic number.

It is an amenable number.

25638265 is a deficient number, since it is larger than the sum of its proper divisors (6203015).

25638265 is a wasteful number, since it uses less digits than its factorization.

25638265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its digits is 86400, while the sum is 37.

The square root of 25638265 is about 5063.4242366209. The cubic root of 25638265 is about 294.8692899815.

The spelling of 25638265 in words is "twenty-five million, six hundred thirty-eight thousand, two hundred sixty-five".