68139367 has 4 divisors (see below), whose sum is σ = 68156136. Its totient is φ = 68122600.

The previous prime is 68139359. The next prime is 68139371. The reversal of 68139367 is 76393186.

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 68139367 - 2³ = 68139359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68139307) 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, 1992 + ... + 11842.

It is an arithmetic number, because the mean of its divisors is an integer number (17039034).

Almost surely, 2^68139367 is an apocalyptic number.

68139367 is a deficient number, since it is larger than the sum of its proper divisors (16769).

68139367 is an equidigital number, since it uses as much as digits as its factorization.

68139367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16768.

The product of its digits is 163296, while the sum is 43.

The square root of 68139367 is about 8254.6572914931. The cubic root of 68139367 is about 408.4441669798. Note that the first 3 decimals are identical.

The spelling of 68139367 in words is "sixty-eight million, one hundred thirty-nine thousand, three hundred sixty-seven".