9989893864 has 8 divisors (see below), whose sum is σ = 18731051010. Its totient is φ = 4994946928.

The previous prime is 9989893769. The next prime is 9989893913. The reversal of 9989893864 is 4683989899.

It can be written as a sum of positive squares in only one way, i.e., 5153804100 + 4836089764 = 71790^2 + 69542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624368359 + ... + 624368374.

Almost surely, 2^9989893864 is an apocalyptic number.

It is an amenable number.

9989893864 is a deficient number, since it is larger than the sum of its proper divisors (8741157146).

9989893864 is a wasteful number, since it uses less digits than its factorization.

9989893864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248736739 (or 1248736735 counting only the distinct ones).

The product of its digits is 241864704, while the sum is 73.

The square root of 9989893864 is about 99949.4565467967. The cubic root of 9989893864 is about 2153.7086784052.

The spelling of 9989893864 in words is "nine billion, nine hundred eighty-nine million, eight hundred ninety-three thousand, eight hundred sixty-four".