8999821328 has 20 divisors (see below), whose sum is σ = 17443600428. Its totient is φ = 4498247040.

The previous prime is 8999821321. The next prime is 8999821349. The reversal of 8999821328 is 8231289998.

It can be written as a sum of positive squares in 2 ways, for example, as 6914255104 + 2085566224 = 83152^2 + 45668^2 .

It is not an unprimeable number, because it can be changed into a prime (8999821321) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 58751 + ... + 146462.

Almost surely, 2^8999821328 is an apocalyptic number.

It is an amenable number.

8999821328 is a deficient number, since it is larger than the sum of its proper divisors (8443779100).

8999821328 is a wasteful number, since it uses less digits than its factorization.

8999821328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207962 (or 207956 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 59.

The square root of 8999821328 is about 94867.3881162542. The cubic root of 8999821328 is about 2080.0700580446.

The spelling of 8999821328 in words is "eight billion, nine hundred ninety-nine million, eight hundred twenty-one thousand, three hundred twenty-eight".