25808 has 10 divisors (see below), whose sum is σ = 50034. Its totient is φ = 12896.

The previous prime is 25801. The next prime is 25819. The reversal of 25808 is 80852.

It can be written as a sum of positive squares in only one way, i.e., 23104 + 2704 = 152^2 + 52^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25801) by changing a digit.

25808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 791 + ... + 822.

2²⁵⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

25808 is a deficient number, since it is larger than the sum of its proper divisors (24226).

25808 is a wasteful number, since it uses less digits than its factorization.

25808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 25808 is about 160.6486850242. The cubic root of 25808 is about 29.5518574611.

The spelling of 25808 in words is "twenty-five thousand, eight hundred eight".