25806528 has 84 divisors (see below), whose sum is σ = 80714088. Its totient is φ = 7818240.

The previous prime is 25806509. The next prime is 25806533. The reversal of 25806528 is 82560852.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25806492 and 25806501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4300 + ... + 8372.

It is an arithmetic number, because the mean of its divisors is an integer number (960882).

Almost surely, 2^25806528 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 25806528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40357044).

25806528 is an abundant number, since it is smaller than the sum of its proper divisors (54907560).

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

25806528 is a wasteful number, since it uses less digits than its factorization.

25806528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102 (or 4089 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 25806528 is about 5080.0125984096. The cubic root of 25806528 is about 295.5129560485.

The spelling of 25806528 in words is "twenty-five million, eight hundred six thousand, five hundred twenty-eight".