8321643872 has 24 divisors (see below), whose sum is σ = 16419753000. Its totient is φ = 4151547904.

The previous prime is 8321643839. The next prime is 8321643907. The reversal of 8321643872 is 2783461238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275222 + ... + 303957.

It is an arithmetic number, because the mean of its divisors is an integer number (684156375).

Almost surely, 2^8321643872 is an apocalyptic number.

It is an amenable number.

8321643872 is a deficient number, since it is larger than the sum of its proper divisors (8098109128).

8321643872 is a wasteful number, since it uses less digits than its factorization.

8321643872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579638 (or 579630 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 8321643872 is about 91223.0446323735. The cubic root of 8321643872 is about 2026.4522527283.

The spelling of 8321643872 in words is "eight billion, three hundred twenty-one million, six hundred forty-three thousand, eight hundred seventy-two".