9999910758728 has 324 divisors, whose sum is σ = 22039477967115. Its totient is φ = 4250299046400.

The previous prime is 9999910758701. The next prime is 9999910758779. The reversal of 9999910758728 is 8278570199999.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 3918744894724 + 6081165864004 = 1979582^2 + 2466002^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2236058.

It is a super-3 number, since 3×9999910758728³ (a number of 40 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 149252399351 + ... + 149252399417.

Almost surely, 2^{9999910758728} 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 9999910758728

9999910758728 is an abundant number, since it is smaller than the sum of its proper divisors (12039567208387).

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

9999910758728 is a wasteful number, since it uses less digits than its factorization.

9999910758728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 1851776640, while the sum is 83.

The spelling of 9999910758728 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ten million, seven hundred fifty-eight thousand, seven hundred twenty-eight".