25257856 has 64 divisors (see below), whose sum is σ = 55606320. Its totient is φ = 11354112.

The previous prime is 25257853. The next prime is 25257857. The reversal of 25257856 is 65875252.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25257851) 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, 71376 + ... + 71728.

Almost surely, 2^25257856 is an apocalyptic number.

25257856 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 25257856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27803160).

25257856 is an abundant number, since it is smaller than the sum of its proper divisors (30348464).

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

25257856 is a wasteful number, since it uses less digits than its factorization.

25257856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 411 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The square root of 25257856 is about 5025.7194509841. The cubic root of 25257856 is about 293.4036378776.

The spelling of 25257856 in words is "twenty-five million, two hundred fifty-seven thousand, eight hundred fifty-six".