25870 has 16 divisors (see below), whose sum is σ = 50400. Its totient is φ = 9504.

The previous prime is 25867. The next prime is 25873. The reversal of 25870 is 7852.

25870 = 26² + 27² + ... + 45².

It is an interprime number because it is at equal distance from previous prime (25867) and next prime (25873).

It is an alternating number because its digits alternate between even and odd.

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 (25873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31 + ... + 229.

It is an arithmetic number, because the mean of its divisors is an integer number (3150).

2²⁵⁸⁷⁰ is an apocalyptic number.

25870 is a deficient number, since it is larger than the sum of its proper divisors (24530).

25870 is a wasteful number, since it uses less digits than its factorization.

25870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 25870 is about 160.8415369238. The cubic root of 25870 is about 29.5755032287.

The spelling of 25870 in words is "twenty-five thousand, eight hundred seventy".