68836139 has 4 divisors (see below), whose sum is σ = 68852760. Its totient is φ = 68819520.

The previous prime is 68836129. The next prime is 68836189. The reversal of 68836139 is 93163886.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68836139 - 2⁴ = 68836123 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 68836139.

It is not an unprimeable number, because it can be changed into a prime (68836109) 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, 3452 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (17213190).

Almost surely, 2^68836139 is an apocalyptic number.

68836139 is a deficient number, since it is larger than the sum of its proper divisors (16621).

68836139 is an equidigital number, since it uses as much as digits as its factorization.

68836139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16620.

The product of its digits is 186624, while the sum is 44.

The square root of 68836139 is about 8296.7547270002. The cubic root of 68836139 is about 409.8316560519.

The spelling of 68836139 in words is "sixty-eight million, eight hundred thirty-six thousand, one hundred thirty-nine".