9898987798 has 32 divisors (see below), whose sum is σ = 17173140480. Its totient is φ = 4191633600.

The previous prime is 9898987789. The next prime is 9898987799. The reversal of 9898987798 is 8977898989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9898987799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2568573 + ... + 2572423.

It is an arithmetic number, because the mean of its divisors is an integer number (536660640).

Almost surely, 2^9898987798 is an apocalyptic number.

9898987798 is a deficient number, since it is larger than the sum of its proper divisors (7274152682).

9898987798 is a wasteful number, since it uses less digits than its factorization.

9898987798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6012.

The product of its digits is 1316818944, while the sum is 82.

The square root of 9898987798 is about 99493.6570742075. The cubic root of 9898987798 is about 2147.1559870750.

The spelling of 9898987798 in words is "nine billion, eight hundred ninety-eight million, nine hundred eighty-seven thousand, seven hundred ninety-eight".