25690 has 16 divisors (see below), whose sum is σ = 52992. Its totient is φ = 8784.

The previous prime is 25679. The next prime is 25693. The reversal of 25690 is 9652.

It is a super-2 number, since 2×25690² = 1319952200, which contains 22 as substring.

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

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25693) 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, 114 + ... + 253.

It is an arithmetic number, because the mean of its divisors is an integer number (3312).

2²⁵⁶⁹⁰ is an apocalyptic number.

25690 is an abundant number, since it is smaller than the sum of its proper divisors (27302).

It is a weird number, because it is abundant, but not a pseudoperfect number.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26496).

25690 is a wasteful number, since it uses less digits than its factorization.

25690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 25690 is about 160.2810032412. The cubic root of 25690 is about 29.5067493893.

The spelling of 25690 in words is "twenty-five thousand, six hundred ninety".