7868561729 has 8 divisors (see below), whose sum is σ = 9183975168. Its totient is φ = 6600981600.

The previous prime is 7868561669. The next prime is 7868561759. The reversal of 7868561729 is 9271658687.

It is a happy number.

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 7868561729 - 2²⁴ = 7851784513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7868561759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11957972 + ... + 11958629.

It is an arithmetic number, because the mean of its divisors is an integer number (1147996896).

Almost surely, 2^7868561729 is an apocalyptic number.

It is an amenable number.

7868561729 is a deficient number, since it is larger than the sum of its proper divisors (1315413439).

7868561729 is a wasteful number, since it uses less digits than its factorization.

7868561729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23916655.

The product of its digits is 10160640, while the sum is 59.

The square root of 7868561729 is about 88704.9137815939. The cubic root of 7868561729 is about 1988.9862709689.

The spelling of 7868561729 in words is "seven billion, eight hundred sixty-eight million, five hundred sixty-one thousand, seven hundred twenty-nine".