8639021928 has 16 divisors (see below), whose sum is σ = 21597554880. Its totient is φ = 2879673968.

The previous prime is 8639021921. The next prime is 8639021929. The reversal of 8639021928 is 8291209368.

It is not an unprimeable number, because it can be changed into a prime (8639021921) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 179979600 + ... + 179979647.

It is an arithmetic number, because the mean of its divisors is an integer number (1349847180).

Almost surely, 2^8639021928 is an apocalyptic number.

It is an amenable number.

8639021928 is an abundant number, since it is smaller than the sum of its proper divisors (12958532952).

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

8639021928 is a wasteful number, since it uses less digits than its factorization.

8639021928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359959256 (or 359959252 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 8639021928 is about 92946.3389703973. The cubic root of 8639021928 is about 2051.8937034793.

The spelling of 8639021928 in words is "eight billion, six hundred thirty-nine million, twenty-one thousand, nine hundred twenty-eight".