25855856 has 40 divisors (see below), whose sum is σ = 54309024. Its totient is φ = 11854080.

The previous prime is 25855799. The next prime is 25855867. The reversal of 25855856 is 65855852.

It is a congruent number.

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, 40661 + ... + 41291.

Almost surely, 2^25855856 is an apocalyptic number.

25855856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25855856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27154512).

25855856 is an abundant number, since it is smaller than the sum of its proper divisors (28453168).

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

25855856 is a wasteful number, since it uses less digits than its factorization.

25855856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 843 counting only the distinct ones).

The product of its digits is 480000, while the sum is 44.

The square root of 25855856 is about 5084.8653866155. The cubic root of 25855856 is about 295.7011227164.

The spelling of 25855856 in words is "twenty-five million, eight hundred fifty-five thousand, eight hundred fifty-six".