25638765 has 8 divisors (see below), whose sum is σ = 41022048. Its totient is φ = 13674000.

The previous prime is 25638757. The next prime is 25638791. The reversal of 25638765 is 56783652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25638765 - 2³ = 25638757 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854611 + ... + 854640.

It is an arithmetic number, because the mean of its divisors is an integer number (5127756).

Almost surely, 2^25638765 is an apocalyptic number.

It is an amenable number.

25638765 is a deficient number, since it is larger than the sum of its proper divisors (15383283).

25638765 is a wasteful number, since it uses less digits than its factorization.

25638765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709259.

The product of its digits is 302400, while the sum is 42.

The square root of 25638765 is about 5063.4736100823. The cubic root of 25638765 is about 294.8712068258.

The spelling of 25638765 in words is "twenty-five million, six hundred thirty-eight thousand, seven hundred sixty-five".