9999999999928 has 16 divisors (see below), whose sum is σ = 18751295196000. Its totient is φ = 4999654614336.

The previous prime is 9999999999863. The next prime is 9999999999971. The reversal of 9999999999928 is 8299999999999.

9999999999928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-9 number, since 9×9999999999928⁹ (a number of 118 digits) contains 999999999 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43050133 + ... + 43281796.

It is an arithmetic number, because the mean of its divisors is an integer number (1171955949750).

Almost surely, 2^{9999999999928} is an apocalyptic number.

It is an amenable number.

9999999999928 is a deficient number, since it is larger than the sum of its proper divisors (8751295196072).

9999999999928 is a wasteful number, since it uses less digits than its factorization.

9999999999928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86346414 (or 86346410 counting only the distinct ones).

The product of its digits is 502096953744, while the sum is 109.

It can be divided in two parts, 999999999992 and 8, that added together give a 12-th power (1000000000000 = 10¹²).

The spelling of 9999999999928 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-eight".