25857656 has 32 divisors (see below), whose sum is σ = 53768880. Its totient is φ = 11558400.

The previous prime is 25857653. The next prime is 25857679. The reversal of 25857656 is 65675852.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25857653) 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, 2960 + ... + 7776.

Almost surely, 2^25857656 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 25857656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26884440).

25857656 is an abundant number, since it is smaller than the sum of its proper divisors (27911224).

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

25857656 is a wasteful number, since it uses less digits than its factorization.

25857656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4895 (or 4891 counting only the distinct ones).

The product of its digits is 504000, while the sum is 44.

The square root of 25857656 is about 5085.0423793711. The cubic root of 25857656 is about 295.7079844717.

The spelling of 25857656 in words is "twenty-five million, eight hundred fifty-seven thousand, six hundred fifty-six".