68728077794 has 8 divisors (see below), whose sum is σ = 103133811180. Its totient is φ = 34350140736.

The previous prime is 68728077791. The next prime is 68728077799. The reversal of 68728077794 is 49777082786.

It can be written as a sum of positive squares in 2 ways, for example, as 67873275625 + 854802169 = 260525^2 + 29237^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68728077794.

It is not an unprimeable number, because it can be changed into a prime (68728077791) 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 3 ways as a sum of consecutive naturals, for example, 6942899 + ... + 6952790.

Almost surely, 2^68728077794 is an apocalyptic number.

68728077794 is a deficient number, since it is larger than the sum of its proper divisors (34405733386).

68728077794 is a wasteful number, since it uses less digits than its factorization.

68728077794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13898164.

The product of its (nonzero) digits is 66382848, while the sum is 65.

The spelling of 68728077794 in words is "sixty-eight billion, seven hundred twenty-eight million, seventy-seven thousand, seven hundred ninety-four".