9983978878 has 16 divisors (see below), whose sum is σ = 15005122560. Its totient is φ = 4982283000.

The previous prime is 9983978863. The next prime is 9983978899. The reversal of 9983978878 is 8788793899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2942563 + ... + 2945953.

It is an arithmetic number, because the mean of its divisors is an integer number (937820160).

Almost surely, 2^9983978878 is an apocalyptic number.

9983978878 is a deficient number, since it is larger than the sum of its proper divisors (5021143682).

9983978878 is a wasteful number, since it uses less digits than its factorization.

9983978878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5823.

The product of its digits is 438939648, while the sum is 76.

The square root of 9983978878 is about 99919.8622797289. The cubic root of 9983978878 is about 2153.2835263480.

The spelling of 9983978878 in words is "nine billion, nine hundred eighty-three million, nine hundred seventy-eight thousand, eight hundred seventy-eight".