68979890228 has 6 divisors (see below), whose sum is σ = 120714807906. Its totient is φ = 34489945112.

The previous prime is 68979890207. The next prime is 68979890263. The reversal of 68979890228 is 82209897986.

It can be written as a sum of positive squares in only one way, i.e., 68524579984 + 455310244 = 261772^2 + 21338^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8622486275 + ... + 8622486282.

It is an arithmetic number, because the mean of its divisors is an integer number (20119134651).

Almost surely, 2^68979890228 is an apocalyptic number.

It is an amenable number.

68979890228 is a deficient number, since it is larger than the sum of its proper divisors (51734917678).

68979890228 is a wasteful number, since it uses less digits than its factorization.

68979890228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17244972561 (or 17244972559 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 68.

The spelling of 68979890228 in words is "sixty-eight billion, nine hundred seventy-nine million, eight hundred ninety thousand, two hundred twenty-eight".