25687 has 4 divisors (see below), whose sum is σ = 27216. Its totient is φ = 24160.

The previous prime is 25679. The next prime is 25693. The reversal of 25687 is 78652.

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

It is a cyclic number.

It is not a de Polignac number, because 25687 - 2³ = 25679 is a prime.

It is a Duffinian number.

25687 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739 + ... + 772.

It is an arithmetic number, because the mean of its divisors is an integer number (6804).

2²⁵⁶⁸⁷ is an apocalyptic number.

25687 is a deficient number, since it is larger than the sum of its proper divisors (1529).

25687 is a wasteful number, since it uses less digits than its factorization.

25687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its digits is 3360, while the sum is 28.

The square root of 25687 is about 160.2716444041. The cubic root of 25687 is about 29.5056007751.

It can be divided in two parts, 256 and 87, that added together give a palindrome (343).

The spelling of 25687 in words is "twenty-five thousand, six hundred eighty-seven".