25887861 has 12 divisors (see below), whose sum is σ = 39361920. Its totient is φ = 16350120.

The previous prime is 25887853. The next prime is 25887871. The reversal of 25887861 is 16878852.

25887861 is a `hidden beast` number, since 2 + 588 + 7 + 8 + 61 = 666.

It is not a de Polignac number, because 25887861 - 2³ = 25887853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25887871) 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 11 ways as a sum of consecutive naturals, for example, 75525 + ... + 75866.

It is an arithmetic number, because the mean of its divisors is an integer number (3280160).

Almost surely, 2^25887861 is an apocalyptic number.

It is an amenable number.

25887861 is a deficient number, since it is larger than the sum of its proper divisors (13474059).

25887861 is a wasteful number, since it uses less digits than its factorization.

25887861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151416 (or 151413 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 25887861 is about 5088.0114976285. The cubic root of 25887861 is about 295.8230810615.

Subtracting from 25887861 its reverse (16878852), we obtain a palindrome (9009009).

The spelling of 25887861 in words is "twenty-five million, eight hundred eighty-seven thousand, eight hundred sixty-one".