9987919800 has 96 divisors (see below), whose sum is σ = 31717813680. Its totient is φ = 2598476800.

The previous prime is 9987919769. The next prime is 9987919811. The reversal of 9987919800 is 89197899.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 178407 + ... + 227606.

Almost surely, 2^9987919800 is an apocalyptic number.

It is an amenable number.

9987919800 is an abundant number, since it is smaller than the sum of its proper divisors (21729893880).

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

9987919800 is a wasteful number, since it uses less digits than its factorization.

9987919800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406073 (or 406064 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 60.

The square root of 9987919800 is about 99939.5807475697. The cubic root of 9987919800 is about 2153.5668070666.

The spelling of 9987919800 in words is "nine billion, nine hundred eighty-seven million, nine hundred nineteen thousand, eight hundred".