25664885 has 8 divisors (see below), whose sum is σ = 30833880. Its totient is φ = 20507904.

The previous prime is 25664843. The next prime is 25664887. The reversal of 25664885 is 58846652.

It can be written as a sum of positive squares in 4 ways, for example, as 5080516 + 20584369 = 2254^2 + 4537^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25664885 - 2⁸ = 25664629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (3854235).

Almost surely, 2^25664885 is an apocalyptic number.

It is an amenable number.

25664885 is a deficient number, since it is larger than the sum of its proper divisors (5168995).

25664885 is a wasteful number, since it uses less digits than its factorization.

25664885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007.

The product of its digits is 460800, while the sum is 44.

The square root of 25664885 is about 5066.0522105482. The cubic root of 25664885 is about 294.9713081355.

The spelling of 25664885 in words is "twenty-five million, six hundred sixty-four thousand, eight hundred eighty-five".