25328134728 has 128 divisors (see below), whose sum is σ = 75826800000. Its totient is φ = 7787218176.

The previous prime is 25328134723. The next prime is 25328134739. The reversal of 25328134728 is 82743182352.

25328134728 is a `hidden beast` number, since 2 + 5 + 3 + 281 + 347 + 28 = 666.

It is not an unprimeable number, because it can be changed into a prime (25328134723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4768138 + ... + 4773446.

It is an arithmetic number, because the mean of its divisors is an integer number (592396875).

Almost surely, 2^25328134728 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 25328134728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37913400000).

25328134728 is an abundant number, since it is smaller than the sum of its proper divisors (50498665272).

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

25328134728 is a wasteful number, since it uses less digits than its factorization.

25328134728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036 (or 7026 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The spelling of 25328134728 in words is "twenty-five billion, three hundred twenty-eight million, one hundred thirty-four thousand, seven hundred twenty-eight".