991998336 has 96 divisors (see below), whose sum is σ = 3065257080. Its totient is φ = 283422720.

The previous prime is 991998323. The next prime is 991998353. The reversal of 991998336 is 633899199.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7545 + ... + 45176.

Almost surely, 2^991998336 is an apocalyptic number.

991998336 is a gapful number since it is divisible by the number (96) 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 991998336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532628540).

991998336 is an abundant number, since it is smaller than the sum of its proper divisors (2073258744).

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

991998336 is a wasteful number, since it uses less digits than its factorization.

991998336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52752 (or 52733 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 57.

The square root of 991998336 is about 31496.0050800098. The cubic root of 991998336 is about 997.3256328027.

The spelling of 991998336 in words is "nine hundred ninety-one million, nine hundred ninety-eight thousand, three hundred thirty-six".