25689945 has 16 divisors (see below), whose sum is σ = 41173632. Its totient is φ = 13678080.

The previous prime is 25689943. The next prime is 25689953. The reversal of 25689945 is 54998652.

It is not a de Polignac number, because 25689945 - 2¹ = 25689943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25689894 and 25689903.

It is not an unprimeable number, because it can be changed into a prime (25689943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11305 + ... + 13385.

It is an arithmetic number, because the mean of its divisors is an integer number (2573352).

Almost surely, 2^25689945 is an apocalyptic number.

It is an amenable number.

25689945 is a deficient number, since it is larger than the sum of its proper divisors (15483687).

25689945 is a wasteful number, since it uses less digits than its factorization.

25689945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912.

The product of its digits is 777600, while the sum is 48.

The square root of 25689945 is about 5068.5249333509. The cubic root of 25689945 is about 295.0672833219.

The spelling of 25689945 in words is "twenty-five million, six hundred eighty-nine thousand, nine hundred forty-five".