9983978885 has 16 divisors (see below), whose sum is σ = 12570004992. Its totient is φ = 7602811200.

The previous prime is 9983978863. The next prime is 9983978899. The reversal of 9983978885 is 5888793899.

9983978885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9983978885 - 2¹⁸ = 9983716741 is a prime.

It is a super-2 number, since 2×9983978885² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 518519 + ... + 537428.

It is an arithmetic number, because the mean of its divisors is an integer number (785625312).

Almost surely, 2^9983978885 is an apocalyptic number.

It is an amenable number.

9983978885 is a deficient number, since it is larger than the sum of its proper divisors (2586026107).

9983978885 is a wasteful number, since it uses less digits than its factorization.

9983978885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056044.

The product of its digits is 313528320, while the sum is 74.

The square root of 9983978885 is about 99919.8623147570. The cubic root of 9983978885 is about 2153.2835268513.

The spelling of 9983978885 in words is "nine billion, nine hundred eighty-three million, nine hundred seventy-eight thousand, eight hundred eighty-five".