68139042 has 16 divisors (see below), whose sum is σ = 136763040. Its totient is φ = 22632192.

The previous prime is 68138999. The next prime is 68139083. The reversal of 68139042 is 24093186.

It is a junction number, because it is equal to n+sod(n) for n = 68138994 and 68139012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18367 + ... + 21762.

It is an arithmetic number, because the mean of its divisors is an integer number (8547690).

Almost surely, 2^68139042 is an apocalyptic number.

68139042 is an abundant number, since it is smaller than the sum of its proper divisors (68623998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68139042 is a wasteful number, since it uses less digits than its factorization.

68139042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40417.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 68139042 is about 8254.6376056130. The cubic root of 68139042 is about 408.4435176021.

The spelling of 68139042 in words is "sixty-eight million, one hundred thirty-nine thousand, forty-two".