68115939 has 16 divisors (see below), whose sum is σ = 91960704. Its totient is φ = 44844800.

The previous prime is 68115917. The next prime is 68115961. The reversal of 68115939 is 93951186.

It is an interprime number because it is at equal distance from previous prime (68115917) and next prime (68115961).

It is a cyclic number.

It is not a de Polignac number, because 68115939 - 2¹⁶ = 68050403 is a prime.

It is a super-2 number, since 2×68115939² = 9279562291703442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68115939.

It is not an unprimeable number, because it can be changed into a prime (68115979) 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, 138484 + ... + 138974.

It is an arithmetic number, because the mean of its divisors is an integer number (5747544).

Almost surely, 2^68115939 is an apocalyptic number.

68115939 is a deficient number, since it is larger than the sum of its proper divisors (23844765).

68115939 is a wasteful number, since it uses less digits than its factorization.

68115939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978.

The product of its digits is 58320, while the sum is 42.

The square root of 68115939 is about 8253.2380918037. The cubic root of 68115939 is about 408.3973505443.

The spelling of 68115939 in words is "sixty-eight million, one hundred fifteen thousand, nine hundred thirty-nine".