9978998800 has 30 divisors (see below), whose sum is σ = 23974545578. Its totient is φ = 3991599360.

The previous prime is 9978998791. The next prime is 9978998831. The reversal of 9978998800 is 88998799.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 163737616 + 9815261184 = 12796^2 + 99072^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 12473349 + ... + 12474148.

Almost surely, 2^9978998800 is an apocalyptic number.

It is an amenable number.

9978998800 is an abundant number, since it is smaller than the sum of its proper divisors (13995546778).

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

9978998800 is a wasteful number, since it uses less digits than its factorization.

9978998800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24947515 (or 24947504 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 67.

The square root of 9978998800 is about 99894.9388107325. The cubic root of 9978998800 is about 2152.9254425443.

The spelling of 9978998800 in words is "nine billion, nine hundred seventy-eight million, nine hundred ninety-eight thousand, eight hundred".