8679638221 has 4 divisors (see below), whose sum is σ = 8728128000. Its totient is φ = 8631148444.

The previous prime is 8679638207. The next prime is 8679638237. The reversal of 8679638221 is 1228369768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8679638221 - 2³³ = 89703629 is a prime.

It is a super-2 number, since 2×8679638221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8679638251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24244621 + ... + 24244978.

It is an arithmetic number, because the mean of its divisors is an integer number (2182032000).

Almost surely, 2^8679638221 is an apocalyptic number.

It is an amenable number.

8679638221 is a deficient number, since it is larger than the sum of its proper divisors (48489779).

8679638221 is a wasteful number, since it uses less digits than its factorization.

8679638221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48489778.

The product of its digits is 1741824, while the sum is 52.

The square root of 8679638221 is about 93164.5759986058. The cubic root of 8679638221 is about 2055.1043311286.

The spelling of 8679638221 in words is "eight billion, six hundred seventy-nine million, six hundred thirty-eight thousand, two hundred twenty-one".