9991437996 has 24 divisors (see below), whose sum is σ = 23329245184. Its totient is φ = 3328209360.

The previous prime is 9991437979. The next prime is 9991437997. The reversal of 9991437996 is 6997341999.

9991437996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9991437997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265360 + ... + 300663.

Almost surely, 2^9991437996 is an apocalyptic number.

It is an amenable number.

9991437996 is an abundant number, since it is smaller than the sum of its proper divisors (13337807188).

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

9991437996 is a wasteful number, since it uses less digits than its factorization.

9991437996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567501 (or 567499 counting only the distinct ones).

The product of its digits is 29760696, while the sum is 66.

The square root of 9991437996 is about 99957.1808125859. The cubic root of 9991437996 is about 2153.8196385149.

The spelling of 9991437996 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-seven thousand, nine hundred ninety-six".