68531439 has 4 divisors (see below), whose sum is σ = 91375256. Its totient is φ = 45687624.

The previous prime is 68531431. The next prime is 68531443. The reversal of 68531439 is 93413586.

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

It is not a de Polignac number, because 68531439 - 2³ = 68531431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68531397 and 68531406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68531431) 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, 11421904 + ... + 11421909.

It is an arithmetic number, because the mean of its divisors is an integer number (22843814).

Almost surely, 2^68531439 is an apocalyptic number.

68531439 is a deficient number, since it is larger than the sum of its proper divisors (22843817).

68531439 is a wasteful number, since it uses less digits than its factorization.

68531439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22843816.

The product of its digits is 77760, while the sum is 39.

The square root of 68531439 is about 8278.3717601954. The cubic root of 68531439 is about 409.2260613064.

The spelling of 68531439 in words is "sixty-eight million, five hundred thirty-one thousand, four hundred thirty-nine".