25531728 has 20 divisors (see below), whose sum is σ = 65957088. Its totient is φ = 8510560.

The previous prime is 25531717. The next prime is 25531729. The reversal of 25531728 is 82713552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25531729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265908 + ... + 266003.

Almost surely, 2^25531728 is an apocalyptic number.

It is an amenable number.

25531728 is an abundant number, since it is smaller than the sum of its proper divisors (40425360).

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

25531728 is a wasteful number, since it uses less digits than its factorization.

25531728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531922 (or 531916 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 25531728 is about 5052.8930327091. The cubic root of 25531728 is about 294.4602906019.

The spelling of 25531728 in words is "twenty-five million, five hundred thirty-one thousand, seven hundred twenty-eight".