25864728 has 16 divisors (see below), whose sum is σ = 64661880. Its totient is φ = 8621568.

The previous prime is 25864717. The next prime is 25864733. The reversal of 25864728 is 82746852.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 25864728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538825 + ... + 538872.

Almost surely, 2^25864728 is an apocalyptic number.

It is an amenable number.

25864728 is an abundant number, since it is smaller than the sum of its proper divisors (38797152).

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

25864728 is a wasteful number, since it uses less digits than its factorization.

25864728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077706 (or 1077702 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 25864728 is about 5085.7377046010. The cubic root of 25864728 is about 295.7349404629.

The spelling of 25864728 in words is "twenty-five million, eight hundred sixty-four thousand, seven hundred twenty-eight".