25638065 has 4 divisors (see below), whose sum is σ = 30765684. Its totient is φ = 20510448.

The previous prime is 25638047. The next prime is 25638073. The reversal of 25638065 is 56083652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9541921 + 16096144 = 3089^2 + 4012^2 .

It is a cyclic number.

It is not a de Polignac number, because 25638065 - 2⁸ = 25637809 is a prime.

It is a Duffinian 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, 2563802 + ... + 2563811.

It is an arithmetic number, because the mean of its divisors is an integer number (7691421).

Almost surely, 2^25638065 is an apocalyptic number.

It is an amenable number.

25638065 is a deficient number, since it is larger than the sum of its proper divisors (5127619).

25638065 is an equidigital number, since it uses as much as digits as its factorization.

25638065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5127618.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 25638065 is about 5063.4044871015. The cubic root of 25638065 is about 294.8685232368.

The spelling of 25638065 in words is "twenty-five million, six hundred thirty-eight thousand, sixty-five".