25697689 has 4 divisors (see below), whose sum is σ = 25759440. Its totient is φ = 25635940.

The previous prime is 25697681. The next prime is 25697701. The reversal of 25697689 is 98679652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25697689 - 2³ = 25697681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25697681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30247 + ... + 31084.

It is an arithmetic number, because the mean of its divisors is an integer number (6439860).

Almost surely, 2^25697689 is an apocalyptic number.

It is an amenable number.

25697689 is a deficient number, since it is larger than the sum of its proper divisors (61751).

25697689 is an equidigital number, since it uses as much as digits as its factorization.

25697689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61750.

The product of its digits is 1632960, while the sum is 52.

The square root of 25697689 is about 5069.2888061344. The cubic root of 25697689 is about 295.0969287919.

The spelling of 25697689 in words is "twenty-five million, six hundred ninety-seven thousand, six hundred eighty-nine".