8198910721 has 8 divisors (see below), whose sum is σ = 8475487488. Its totient is φ = 7923090000.

The previous prime is 8198910719. The next prime is 8198910757. The reversal of 8198910721 is 1270198918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8198910721 - 2¹ = 8198910719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8198910781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166915 + ... + 210376.

It is an arithmetic number, because the mean of its divisors is an integer number (1059435936).

Almost surely, 2^8198910721 is an apocalyptic number.

It is an amenable number.

8198910721 is a deficient number, since it is larger than the sum of its proper divisors (276576767).

8198910721 is a wasteful number, since it uses less digits than its factorization.

8198910721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378023.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 8198910721 is about 90547.8366445052. The cubic root of 8198910721 is about 2016.4403800678.

The spelling of 8198910721 in words is "eight billion, one hundred ninety-eight million, nine hundred ten thousand, seven hundred twenty-one".