25817865 has 32 divisors (see below), whose sum is σ = 43835520. Its totient is φ = 12939264.

The previous prime is 25817861. The next prime is 25817867. The reversal of 25817865 is 56871852.

It is not a de Polignac number, because 25817865 - 2² = 25817861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25817861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44457 + ... + 45033.

It is an arithmetic number, because the mean of its divisors is an integer number (1369860).

Almost surely, 2^25817865 is an apocalyptic number.

It is an amenable number.

25817865 is a deficient number, since it is larger than the sum of its proper divisors (18017655).

25817865 is a wasteful number, since it uses less digits than its factorization.

25817865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its digits is 134400, while the sum is 42.

The square root of 25817865 is about 5081.1283195763. The cubic root of 25817865 is about 295.5562233943.

The spelling of 25817865 in words is "twenty-five million, eight hundred seventeen thousand, eight hundred sixty-five".