25643256 has 16 divisors (see below), whose sum is σ = 64108200. Its totient is φ = 8547744.

The previous prime is 25643251. The next prime is 25643263. The reversal of 25643256 is 65234652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534211 + ... + 534258.

Almost surely, 2^25643256 is an apocalyptic number.

It is an amenable number.

25643256 is an abundant number, since it is smaller than the sum of its proper divisors (38464944).

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

25643256 is a wasteful number, since it uses less digits than its factorization.

25643256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068478 (or 1068474 counting only the distinct ones).

The product of its digits is 43200, while the sum is 33.

The square root of 25643256 is about 5063.9170609322. The cubic root of 25643256 is about 294.8884228042. Note that the first 3 decimals are identical.

The spelling of 25643256 in words is "twenty-five million, six hundred forty-three thousand, two hundred fifty-six".