25817864 has 16 divisors (see below), whose sum is σ = 49589820. Its totient is φ = 12593920.

The previous prime is 25817861. The next prime is 25817867. The reversal of 25817864 is 46871852.

It is an interprime number because it is at equal distance from previous prime (25817861) and next prime (25817867).

It can be written as a sum of positive squares in 2 ways, for example, as 24900100 + 917764 = 4990^2 + 958^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39029 + ... + 39684.

Almost surely, 2^25817864 is an apocalyptic number.

It is an amenable number.

25817864 is a deficient number, since it is larger than the sum of its proper divisors (23771956).

25817864 is a wasteful number, since it uses less digits than its factorization.

25817864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78760 (or 78756 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 25817864 is about 5081.1282211729. The cubic root of 25817864 is about 295.5562195784.

The spelling of 25817864 in words is "twenty-five million, eight hundred seventeen thousand, eight hundred sixty-four".