68911579 has 4 divisors (see below), whose sum is σ = 75176280. Its totient is φ = 62646880.

The previous prime is 68911571. The next prime is 68911589. The reversal of 68911579 is 97511986.

It is a happy number.

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 68911579 - 2³ = 68911571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68911571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132334 + ... + 3132355.

It is an arithmetic number, because the mean of its divisors is an integer number (18794070).

Almost surely, 2^68911579 is an apocalyptic number.

68911579 is a deficient number, since it is larger than the sum of its proper divisors (6264701).

68911579 is a wasteful number, since it uses less digits than its factorization.

68911579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264700.

The product of its digits is 136080, while the sum is 46.

The square root of 68911579 is about 8301.2998379772. The cubic root of 68911579 is about 409.9813178083.

The spelling of 68911579 in words is "sixty-eight million, nine hundred eleven thousand, five hundred seventy-nine".