25987871 has 16 divisors (see below), whose sum is σ = 32116224. Its totient is φ = 20477664.

The previous prime is 25987859. The next prime is 25987873. The reversal of 25987871 is 17878952.

It is a cyclic number.

It is not a de Polignac number, because 25987871 - 2⁶ = 25987807 is a prime.

It is a super-2 number, since 2×25987871² = 1350738878225282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25987873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31166 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (2007264).

Almost surely, 2^25987871 is an apocalyptic number.

25987871 is a deficient number, since it is larger than the sum of its proper divisors (6128353).

25987871 is a wasteful number, since it uses less digits than its factorization.

25987871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190.

The product of its digits is 282240, while the sum is 47.

The square root of 25987871 is about 5097.8300285514. The cubic root of 25987871 is about 296.2035328616.

The spelling of 25987871 in words is "twenty-five million, nine hundred eighty-seven thousand, eight hundred seventy-one".