25991056 has 40 divisors (see below), whose sum is σ = 61982144. Its totient is φ = 10281600.

The previous prime is 25991039. The next prime is 25991071. The reversal of 25991056 is 65019952.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7470 + ... + 10381.

Almost surely, 2^25991056 is an apocalyptic number.

25991056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25991056 is an abundant number, since it is smaller than the sum of its proper divisors (35991088).

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

25991056 is a wasteful number, since it uses less digits than its factorization.

25991056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17879 (or 17873 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 25991056 is about 5098.1424067988. The cubic root of 25991056 is about 296.2156329899.

It can be divided in two parts, 2599 and 1056, that added together give a triangular number (3655 = T₈₅).

The spelling of 25991056 in words is "twenty-five million, nine hundred ninety-one thousand, fifty-six".