8939138928 has 80 divisors (see below), whose sum is σ = 23607239040. Its totient is φ = 2913977088.

The previous prime is 8939138869. The next prime is 8939138953. The reversal of 8939138928 is 8298319398.

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, 437026 + ... + 457022.

It is an arithmetic number, because the mean of its divisors is an integer number (295090488).

Almost surely, 2^8939138928 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 8939138928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11803619520).

8939138928 is an abundant number, since it is smaller than the sum of its proper divisors (14668100112).

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

8939138928 is a wasteful number, since it uses less digits than its factorization.

8939138928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20214 (or 20208 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 60.

The square root of 8939138928 is about 94547.0196674649. The cubic root of 8939138928 is about 2075.3844685954.

The spelling of 8939138928 in words is "eight billion, nine hundred thirty-nine million, one hundred thirty-eight thousand, nine hundred twenty-eight".