25686861 has 16 divisors (see below), whose sum is σ = 34978944. Its totient is φ = 16763904.

The previous prime is 25686853. The next prime is 25686887. The reversal of 25686861 is 16868652.

It is not a de Polignac number, because 25686861 - 2³ = 25686853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25686851) 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, 29545 + ... + 30401.

It is an arithmetic number, because the mean of its divisors is an integer number (2186184).

Almost surely, 2^25686861 is an apocalyptic number.

It is an amenable number.

25686861 is a deficient number, since it is larger than the sum of its proper divisors (9292083).

25686861 is a wasteful number, since it uses less digits than its factorization.

25686861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its digits is 138240, while the sum is 42.

The square root of 25686861 is about 5068.2206936952. The cubic root of 25686861 is about 295.0554755385.

The spelling of 25686861 in words is "twenty-five million, six hundred eighty-six thousand, eight hundred sixty-one".