25817863 has 4 divisors (see below), whose sum is σ = 25834680. Its totient is φ = 25801048.

The previous prime is 25817861. The next prime is 25817867. The reversal of 25817863 is 36871852.

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

It is a cyclic number.

It is not a de Polignac number, because 25817863 - 2¹ = 25817861 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 (25817861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5845 + ... + 9262.

It is an arithmetic number, because the mean of its divisors is an integer number (6458670).

Almost surely, 2^25817863 is an apocalyptic number.

25817863 is a deficient number, since it is larger than the sum of its proper divisors (16817).

25817863 is a wasteful number, since it uses less digits than its factorization.

25817863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16816.

The product of its digits is 80640, while the sum is 40.

The square root of 25817863 is about 5081.1281227696. The cubic root of 25817863 is about 295.5562157625.

The spelling of 25817863 in words is "twenty-five million, eight hundred seventeen thousand, eight hundred sixty-three".