28438525128 has 64 divisors (see below), whose sum is σ = 76676644800. Its totient is φ = 8737585920.

The previous prime is 28438525121. The next prime is 28438525153. The reversal of 28438525128 is 82152583482.

It is a happy number.

It is a super-2 number, since 2×28438525128² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28438525121) 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 15 ways as a sum of consecutive naturals, for example, 149638 + ... + 281546.

It is an arithmetic number, because the mean of its divisors is an integer number (1198072575).

Almost surely, 2^28438525128 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 28438525128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38338322400).

28438525128 is an abundant number, since it is smaller than the sum of its proper divisors (48238119672).

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

28438525128 is a wasteful number, since it uses less digits than its factorization.

28438525128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132622 (or 132618 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 48.

The spelling of 28438525128 in words is "twenty-eight billion, four hundred thirty-eight million, five hundred twenty-five thousand, one hundred twenty-eight".