9991349988 has 24 divisors (see below), whose sum is σ = 23319686208. Its totient is φ = 3329516256.

The previous prime is 9991349987. The next prime is 9991349989. The reversal of 9991349988 is 8899431999.

It is an interprime number because it is at equal distance from previous prime (9991349987) and next prime (9991349989).

It is not an unprimeable number, because it can be changed into a prime (9991349987) 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, 71431 + ... + 158382.

It is an arithmetic number, because the mean of its divisors is an integer number (971653592).

Almost surely, 2^9991349988 is an apocalyptic number.

It is an amenable number.

9991349988 is an abundant number, since it is smaller than the sum of its proper divisors (13328336220).

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

9991349988 is a wasteful number, since it uses less digits than its factorization.

9991349988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233443 (or 233441 counting only the distinct ones).

The product of its digits is 45349632, while the sum is 69.

The square root of 9991349988 is about 99956.7405831143. The cubic root of 9991349988 is about 2153.8133146365.

The spelling of 9991349988 in words is "nine billion, nine hundred ninety-one million, three hundred forty-nine thousand, nine hundred eighty-eight".