25685689 has 4 divisors (see below), whose sum is σ = 25696756. Its totient is φ = 25674624.

The previous prime is 25685633. The next prime is 25685713. The reversal of 25685689 is 98658652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24920064 + 765625 = 4992^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 25685689 - 2¹⁹ = 25161401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25685629) 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, 564 + ... + 7189.

It is an arithmetic number, because the mean of its divisors is an integer number (6424189).

Almost surely, 2^25685689 is an apocalyptic number.

It is an amenable number.

25685689 is a deficient number, since it is larger than the sum of its proper divisors (11067).

25685689 is an equidigital number, since it uses as much as digits as its factorization.

25685689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11066.

The product of its digits is 1036800, while the sum is 49.

The square root of 25685689 is about 5068.1050699448. The cubic root of 25685689 is about 295.0509880267.

The spelling of 25685689 in words is "twenty-five million, six hundred eighty-five thousand, six hundred eighty-nine".