25664256 has 144 divisors (see below), whose sum is σ = 78489600. Its totient is φ = 8266752.

The previous prime is 25664239. The next prime is 25664257. The reversal of 25664256 is 65246652.

25664256 is a `hidden beast` number, since 2 + 5 + 6 + 642 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25664256.

It is not an unprimeable number, because it can be changed into a prime (25664257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324825 + ... + 324903.

Almost surely, 2^25664256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25664256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39244800).

25664256 is an abundant number, since it is smaller than the sum of its proper divisors (52825344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25664256 is an equidigital number, since it uses as much as digits as its factorization.

25664256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 131 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 25664256 is about 5065.9901302707. The cubic root of 25664256 is about 294.9688983777.

The spelling of 25664256 in words is "twenty-five million, six hundred sixty-four thousand, two hundred fifty-six".