25630728 has 32 divisors (see below), whose sum is σ = 64377600. Its totient is φ = 8503488.

The previous prime is 25630727. The next prime is 25630733. The reversal of 25630728 is 82703652.

It is not an unprimeable number, because it can be changed into a prime (25630727) 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, 2958 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (2011800).

Almost surely, 2^25630728 is an apocalyptic number.

It is an amenable number.

25630728 is an abundant number, since it is smaller than the sum of its proper divisors (38746872).

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

25630728 is a wasteful number, since it uses less digits than its factorization.

25630728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 25630728 is about 5062.6799227287. The cubic root of 25630728 is about 294.8403924507.

The spelling of 25630728 in words is "twenty-five million, six hundred thirty thousand, seven hundred twenty-eight".