8613327721 has 16 divisors (see below), whose sum is σ = 8937189184. Its totient is φ = 8295727104.

The previous prime is 8613327659. The next prime is 8613327761. The reversal of 8613327721 is 1277233168.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8613327721 - 2³³ = 23393129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8613327761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176745 + ... + 1184041.

It is an arithmetic number, because the mean of its divisors is an integer number (558574324).

Almost surely, 2^8613327721 is an apocalyptic number.

It is an amenable number.

8613327721 is a deficient number, since it is larger than the sum of its proper divisors (323861463).

8613327721 is a wasteful number, since it uses less digits than its factorization.

8613327721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720.

The product of its digits is 84672, while the sum is 40.

The square root of 8613327721 is about 92808.0153919908. The cubic root of 8613327721 is about 2049.8574337500.

The spelling of 8613327721 in words is "eight billion, six hundred thirteen million, three hundred twenty-seven thousand, seven hundred twenty-one".