25638671 has 4 divisors (see below), whose sum is σ = 25650144. Its totient is φ = 25627200.

The previous prime is 25638649. The next prime is 25638673. The reversal of 25638671 is 17683652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25638671 - 2⁶ = 25638607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25638673) 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, 1175 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (6412536).

Almost surely, 2^25638671 is an apocalyptic number.

25638671 is a deficient number, since it is larger than the sum of its proper divisors (11473).

25638671 is an equidigital number, since it uses as much as digits as its factorization.

25638671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11472.

The product of its digits is 60480, while the sum is 38.

The square root of 25638671 is about 5063.4643279083. The cubic root of 25638671 is about 294.8708464609.

The spelling of 25638671 in words is "twenty-five million, six hundred thirty-eight thousand, six hundred seventy-one".