9938660728 has 16 divisors (see below), whose sum is σ = 18870876000. Its totient is φ = 4906427136.

The previous prime is 9938660713. The next prime is 9938660779. The reversal of 9938660728 is 8270668399.

9938660728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7862233 + ... + 7863496.

It is an arithmetic number, because the mean of its divisors is an integer number (1179429750).

Almost surely, 2^9938660728 is an apocalyptic number.

It is an amenable number.

9938660728 is a deficient number, since it is larger than the sum of its proper divisors (8932215272).

9938660728 is a wasteful number, since it uses less digits than its factorization.

9938660728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15725814 (or 15725810 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 58.

The square root of 9938660728 is about 99692.8318787264. The cubic root of 9938660728 is about 2150.0206039489.

The spelling of 9938660728 in words is "nine billion, nine hundred thirty-eight million, six hundred sixty thousand, seven hundred twenty-eight".