28128734488 has 64 divisors (see below), whose sum is σ = 56416757760. Its totient is φ = 13116128256.

The previous prime is 28128734477. The next prime is 28128734503. The reversal of 28128734488 is 88443782182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4799656 + ... + 4805512.

It is an arithmetic number, because the mean of its divisors is an integer number (881511840).

Almost surely, 2^28128734488 is an apocalyptic number.

It is an amenable number.

28128734488 is an abundant number, since it is smaller than the sum of its proper divisors (28288023272).

28128734488 is a wasteful number, since it uses less digits than its factorization.

28128734488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6536 (or 6532 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 55.

The spelling of 28128734488 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred thirty-four thousand, four hundred eighty-eight".