8391013668 has 48 divisors (see below), whose sum is σ = 21763356160. Its totient is φ = 2795863392.

The previous prime is 8391013667. The next prime is 8391013699. The reversal of 8391013668 is 8663101938.

It is a happy number.

It is a super-2 number, since 2×8391013668² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8391013667) 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, 274605 + ... + 303627.

Almost surely, 2^8391013668 is an apocalyptic number.

It is an amenable number.

8391013668 is an abundant number, since it is smaller than the sum of its proper divisors (13372342492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8391013668 is a wasteful number, since it uses less digits than its factorization.

8391013668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31713 (or 31705 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 8391013668 is about 91602.4763202393. The cubic root of 8391013668 is about 2032.0675601284.

The spelling of 8391013668 in words is "eight billion, three hundred ninety-one million, thirteen thousand, six hundred sixty-eight".