8765728128 has 96 divisors (see below), whose sum is σ = 26551956600. Its totient is φ = 2768117760.

The previous prime is 8765728067. The next prime is 8765728157. The reversal of 8765728128 is 8218275678.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×8765728128² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178353 + ... + 222128.

Almost surely, 2^8765728128 is an apocalyptic number.

It is an amenable number.

8765728128 is an abundant number, since it is smaller than the sum of its proper divisors (17786228472).

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

8765728128 is a wasteful number, since it uses less digits than its factorization.

8765728128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400520 (or 400505 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 8765728128 is about 93625.4673045748. The cubic root of 8765728128 is about 2061.8765794930.

The spelling of 8765728128 in words is "eight billion, seven hundred sixty-five million, seven hundred twenty-eight thousand, one hundred twenty-eight".