68111993 has 16 divisors (see below), whose sum is σ = 72887040. Its totient is φ = 63512064.

The previous prime is 68111987. The next prime is 68112001. The reversal of 68111993 is 39911186.

It is a cyclic number.

It is not a de Polignac number, because 68111993 - 2¹⁴ = 68095609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68111963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189548 + ... + 189906.

It is an arithmetic number, because the mean of its divisors is an integer number (4555440).

Almost surely, 2^68111993 is an apocalyptic number.

It is an amenable number.

68111993 is a deficient number, since it is larger than the sum of its proper divisors (4775047).

68111993 is a wasteful number, since it uses less digits than its factorization.

68111993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568.

The product of its digits is 11664, while the sum is 38.

The square root of 68111993 is about 8252.9990306555. Note that the first 3 decimals coincide. The cubic root of 68111993 is about 408.3894641519.

The spelling of 68111993 in words is "sixty-eight million, one hundred eleven thousand, nine hundred ninety-three".