68691939 has 8 divisors (see below), whose sum is σ = 94543872. Its totient is φ = 44317320.

The previous prime is 68691929. The next prime is 68691947. The reversal of 68691939 is 93919686.

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

It is not a de Polignac number, because 68691939 - 2⁵ = 68691907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68691891 and 68691900.

It is not an unprimeable number, because it can be changed into a prime (68691929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369219 + ... + 369404.

It is an arithmetic number, because the mean of its divisors is an integer number (11817984).

Almost surely, 2^68691939 is an apocalyptic number.

68691939 is a deficient number, since it is larger than the sum of its proper divisors (25851933).

68691939 is a wasteful number, since it uses less digits than its factorization.

68691939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738657.

The product of its digits is 629856, while the sum is 51.

The square root of 68691939 is about 8288.0600263270. The cubic root of 68691939 is about 409.5452801244.

The spelling of 68691939 in words is "sixty-eight million, six hundred ninety-one thousand, nine hundred thirty-nine".