25680861 has 16 divisors (see below), whose sum is σ = 38476800. Its totient is φ = 16926624.

The previous prime is 25680859. The next prime is 25680877. The reversal of 25680861 is 16808652.

It is a happy number.

It is not a de Polignac number, because 25680861 - 2¹ = 25680859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2941 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (2404800).

Almost surely, 2^25680861 is an apocalyptic number.

It is an amenable number.

25680861 is a deficient number, since it is larger than the sum of its proper divisors (12795939).

25680861 is a wasteful number, since it uses less digits than its factorization.

25680861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10785 (or 10779 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25680861 is about 5067.6287354146. The cubic root of 25680861 is about 295.0325004890.

The spelling of 25680861 in words is "twenty-five million, six hundred eighty thousand, eight hundred sixty-one".