25725866 has 4 divisors (see below), whose sum is σ = 38588802. Its totient is φ = 12862932.

The previous prime is 25725859. The next prime is 25725881. The reversal of 25725866 is 66852752.

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

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 5736025 = 4471^2 + 2395^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6431465 + ... + 6431468.

Almost surely, 2^25725866 is an apocalyptic number.

25725866 is a deficient number, since it is larger than the sum of its proper divisors (12862936).

25725866 is a wasteful number, since it uses less digits than its factorization.

25725866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12862935.

The product of its digits is 201600, while the sum is 41.

The square root of 25725866 is about 5072.0672314156. The cubic root of 25725866 is about 295.2047453476.

The spelling of 25725866 in words is "twenty-five million, seven hundred twenty-five thousand, eight hundred sixty-six".