25531128 has 96 divisors (see below), whose sum is σ = 79747200. Its totient is φ = 7228224.

The previous prime is 25531111. The next prime is 25531139. The reversal of 25531128 is 82113552.

It is a happy number.

25531128 is a `hidden beast` number, since 2 + 5 + 531 + 128 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90075 + ... + 90357.

It is an arithmetic number, because the mean of its divisors is an integer number (830700).

Almost surely, 2^25531128 is an apocalyptic number.

25531128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25531128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39873600).

25531128 is an abundant number, since it is smaller than the sum of its proper divisors (54216072).

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

25531128 is a wasteful number, since it uses less digits than its factorization.

25531128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 474 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 25531128 is about 5052.8336604325. The cubic root of 25531128 is about 294.4579839613.

The spelling of 25531128 in words is "twenty-five million, five hundred thirty-one thousand, one hundred twenty-eight".