9985813944 has 32 divisors (see below), whose sum is σ = 24968059920. Its totient is φ = 3328134656.

The previous prime is 9985813939. The next prime is 9985813963. The reversal of 9985813944 is 4493185899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172432 + ... + 222944.

Almost surely, 2^9985813944 is an apocalyptic number.

It is an amenable number.

9985813944 is an abundant number, since it is smaller than the sum of its proper divisors (14982245976).

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

9985813944 is a wasteful number, since it uses less digits than its factorization.

9985813944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58759 (or 58755 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 60.

The square root of 9985813944 is about 99929.0445466182. The cubic root of 9985813944 is about 2153.4154435382.

The spelling of 9985813944 in words is "nine billion, nine hundred eighty-five million, eight hundred thirteen thousand, nine hundred forty-four".