9988787424 has 192 divisors, whose sum is σ = 33387282432. Its totient is φ = 2539200000.

The previous prime is 9988787381. The next prime is 9988787429. The reversal of 9988787424 is 4247878899.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988787429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333049 + ... + 361799.

It is an arithmetic number, because the mean of its divisors is an integer number (173892096).

Almost surely, 2^9988787424 is an apocalyptic number.

9988787424 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9988787424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16693641216).

9988787424 is an abundant number, since it is smaller than the sum of its proper divisors (23398495008).

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

9988787424 is a wasteful number, since it uses less digits than its factorization.

9988787424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28829 (or 28821 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 66.

The square root of 9988787424 is about 99943.9213959508. The cubic root of 9988787424 is about 2153.6291634659.

The spelling of 9988787424 in words is "nine billion, nine hundred eighty-eight million, seven hundred eighty-seven thousand, four hundred twenty-four".