68688939 has 8 divisors (see below), whose sum is σ = 99911232. Its totient is φ = 41629640.

The previous prime is 68688929. The next prime is 68688941. The reversal of 68688939 is 93988686.

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

It is a cyclic number.

It is not a de Polignac number, because 68688939 - 2²¹ = 66591787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68688929) 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, 1040709 + ... + 1040774.

It is an arithmetic number, because the mean of its divisors is an integer number (12488904).

Almost surely, 2^68688939 is an apocalyptic number.

68688939 is a deficient number, since it is larger than the sum of its proper divisors (31222293).

68688939 is a wasteful number, since it uses less digits than its factorization.

68688939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081497.

The product of its digits is 4478976, while the sum is 57.

The square root of 68688939 is about 8287.8790411058. The cubic root of 68688939 is about 409.5393179802.

The spelling of 68688939 in words is "sixty-eight million, six hundred eighty-eight thousand, nine hundred thirty-nine".