9933126728 has 48 divisors (see below), whose sum is σ = 21676045500. Its totient is φ = 4254956160.

The previous prime is 9933126659. The next prime is 9933126737. The reversal of 9933126728 is 8276213399.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9761044804 + 172081924 = 98798^2 + 13118^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 994238 + ... + 1004178.

Almost surely, 2^9933126728 is an apocalyptic number.

9933126728 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

9933126728 is an abundant number, since it is smaller than the sum of its proper divisors (11742918772).

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

9933126728 is a wasteful number, since it uses less digits than its factorization.

9933126728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12510 (or 12499 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 9933126728 is about 99665.0727587152. The cubic root of 9933126728 is about 2149.6214749515.

The spelling of 9933126728 in words is "nine billion, nine hundred thirty-three million, one hundred twenty-six thousand, seven hundred twenty-eight".