68720173907 has 32 divisors (see below), whose sum is σ = 90750689280. Its totient is φ = 50379540480.

The previous prime is 68720173877. The next prime is 68720173913. The reversal of 68720173907 is 70937102786.

It is a cyclic number.

It is not a de Polignac number, because 68720173907 - 2¹² = 68720169811 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (68720173987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4202894 + ... + 4219212.

It is an arithmetic number, because the mean of its divisors is an integer number (2835959040).

Almost surely, 2^68720173907 is an apocalyptic number.

68720173907 is a deficient number, since it is larger than the sum of its proper divisors (22030515373).

68720173907 is a wasteful number, since it uses less digits than its factorization.

68720173907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19571.

The product of its (nonzero) digits is 889056, while the sum is 50.

The spelling of 68720173907 in words is "sixty-eight billion, seven hundred twenty million, one hundred seventy-three thousand, nine hundred seven".