68938559 has 4 divisors (see below), whose sum is σ = 68957280. Its totient is φ = 68919840.

The previous prime is 68938547. The next prime is 68938561. The reversal of 68938559 is 95583986.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68938559 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 68938559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68932559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (17239320).

Almost surely, 2^68938559 is an apocalyptic number.

68938559 is a deficient number, since it is larger than the sum of its proper divisors (18721).

68938559 is a wasteful number, since it uses less digits than its factorization.

68938559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18720.

The product of its digits is 2332800, while the sum is 53.

The square root of 68938559 is about 8302.9247256614. The cubic root of 68938559 is about 410.0348156039.

The spelling of 68938559 in words is "sixty-eight million, nine hundred thirty-eight thousand, five hundred fifty-nine".