68366139 has 4 divisors (see below), whose sum is σ = 91154856. Its totient is φ = 45577424.

The previous prime is 68366119. The next prime is 68366171. The reversal of 68366139 is 93166386.

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 68366139 - 2⁵ = 68366107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68366139.

It is not an unprimeable number, because it can be changed into a prime (68366119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11394354 + ... + 11394359.

It is an arithmetic number, because the mean of its divisors is an integer number (22788714).

Almost surely, 2^68366139 is an apocalyptic number.

68366139 is a deficient number, since it is larger than the sum of its proper divisors (22788717).

68366139 is a wasteful number, since it uses less digits than its factorization.

68366139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22788716.

The product of its digits is 139968, while the sum is 42.

The square root of 68366139 is about 8268.3818852300. The cubic root of 68366139 is about 408.8967743433.

The spelling of 68366139 in words is "sixty-eight million, three hundred sixty-six thousand, one hundred thirty-nine".