68931818 has 8 divisors (see below), whose sum is σ = 104346660. Its totient is φ = 34149600.

The previous prime is 68931803. The next prime is 68931833. The reversal of 68931818 is 81813986.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (68931803) and next prime (68931833).

It can be written as a sum of positive squares in 2 ways, for example, as 58323769 + 10608049 = 7637^2 + 3257^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 157883 + ... + 158318.

Almost surely, 2^68931818 is an apocalyptic number.

68931818 is a deficient number, since it is larger than the sum of its proper divisors (35414842).

68931818 is a wasteful number, since it uses less digits than its factorization.

68931818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316312.

The product of its digits is 82944, while the sum is 44.

The square root of 68931818 is about 8302.5187744443. The cubic root of 68931818 is about 410.0214503947.

The spelling of 68931818 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred eighteen".