68717021860 has 24 divisors (see below), whose sum is σ = 144322622136. Its totient is φ = 27483594240.

The previous prime is 68717021839. The next prime is 68717021917. The reversal of 68717021860 is 6812071786.

It can be written as a sum of positive squares in 4 ways, for example, as 5860514916 + 62856506944 = 76554^2 + 250712^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68717021860.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21717 + ... + 371356.

It is an arithmetic number, because the mean of its divisors is an integer number (6013442589).

Almost surely, 2^68717021860 is an apocalyptic number.

It is an amenable number.

68717021860 is an abundant number, since it is smaller than the sum of its proper divisors (75605600276).

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

68717021860 is a wasteful number, since it uses less digits than its factorization.

68717021860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401823 (or 401821 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 68717021860 in words is "sixty-eight billion, seven hundred seventeen million, twenty-one thousand, eight hundred sixty".