25648865 has 16 divisors (see below), whose sum is σ = 33794496. Its totient is φ = 18532800.

The previous prime is 25648781. The next prime is 25648867. The reversal of 25648865 is 56884652.

It is not a de Polignac number, because 25648865 - 2¹⁰ = 25647841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25648867) 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, 7535 + ... + 10395.

It is an arithmetic number, because the mean of its divisors is an integer number (2112156).

Almost surely, 2^25648865 is an apocalyptic number.

It is an amenable number.

25648865 is a deficient number, since it is larger than the sum of its proper divisors (8145631).

25648865 is a wasteful number, since it uses less digits than its factorization.

25648865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040.

The product of its digits is 460800, while the sum is 44.

The square root of 25648865 is about 5064.4708509379. The cubic root of 25648865 is about 294.9099217457.

The spelling of 25648865 in words is "twenty-five million, six hundred forty-eight thousand, eight hundred sixty-five".