25656985 has 8 divisors (see below), whose sum is σ = 31106376. Its totient is φ = 20313600.

The previous prime is 25656977. The next prime is 25657007. The reversal of 25656985 is 58965652.

It can be written as a sum of positive squares in 4 ways, for example, as 10259209 + 15397776 = 3203^2 + 3924^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25656985 - 2³ = 25656977 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25966 + ... + 26935.

It is an arithmetic number, because the mean of its divisors is an integer number (3888297).

Almost surely, 2^25656985 is an apocalyptic number.

It is an amenable number.

25656985 is a deficient number, since it is larger than the sum of its proper divisors (5449391).

25656985 is an equidigital number, since it uses as much as digits as its factorization.

25656985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53003.

The product of its digits is 648000, while the sum is 46.

The square root of 25656985 is about 5065.2724507177. The cubic root of 25656985 is about 294.9410396386.

The spelling of 25656985 in words is "twenty-five million, six hundred fifty-six thousand, nine hundred eighty-five".