68108939 has 4 divisors (see below), whose sum is σ = 71693640. Its totient is φ = 64524240.

The previous prime is 68108933. The next prime is 68108983. The reversal of 68108939 is 93980186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68108939 - 2⁸ = 68108683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68108939.

It is not an unprimeable number, because it can be changed into a prime (68108933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792322 + ... + 1792359.

It is an arithmetic number, because the mean of its divisors is an integer number (17923410).

Almost surely, 2^68108939 is an apocalyptic number.

68108939 is a deficient number, since it is larger than the sum of its proper divisors (3584701).

68108939 is a wasteful number, since it uses less digits than its factorization.

68108939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584700.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 68108939 is about 8252.8140049319. The cubic root of 68108939 is about 408.3833602828.

The spelling of 68108939 in words is "sixty-eight million, one hundred eight thousand, nine hundred thirty-nine".