9978998798 has 16 divisors (see below), whose sum is σ = 15141271680. Its totient is φ = 4931942400.

The previous prime is 9978998791. The next prime is 9978998831. The reversal of 9978998798 is 8978998799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978998791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791363 + ... + 803873.

It is an arithmetic number, because the mean of its divisors is an integer number (946329480).

Almost surely, 2^9978998798 is an apocalyptic number.

9978998798 is a deficient number, since it is larger than the sum of its proper divisors (5162272882).

9978998798 is a wasteful number, since it uses less digits than its factorization.

9978998798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17083.

The product of its digits is 1481421312, while the sum is 83.

The square root of 9978998798 is about 99894.9388007220. The cubic root of 9978998798 is about 2152.9254424004.

Subtracting from 9978998798 its reverse (8978998799), we obtain a palindrome (999999999).

The spelling of 9978998798 in words is "nine billion, nine hundred seventy-eight million, nine hundred ninety-eight thousand, seven hundred ninety-eight".