68939668 has 18 divisors (see below), whose sum is σ = 140341866. Its totient is φ = 29545488.

The previous prime is 68939639. The next prime is 68939683. The reversal of 68939668 is 86693986.

It can be written as a sum of positive squares in only one way, i.e., 40934404 + 28005264 = 6398^2 + 5292^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 175671 + ... + 176062.

Almost surely, 2^68939668 is an apocalyptic number.

It is an amenable number.

68939668 is an abundant number, since it is smaller than the sum of its proper divisors (71402198).

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

68939668 is a wasteful number, since it uses less digits than its factorization.

68939668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351751 (or 351742 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The square root of 68939668 is about 8302.9915090888. The cubic root of 68939668 is about 410.0370143065.

It can be divided in two parts, 6893 and 9668, that added together give a palindrome (16561).

The spelling of 68939668 in words is "sixty-eight million, nine hundred thirty-nine thousand, six hundred sixty-eight".