68139007 has 8 divisors (see below), whose sum is σ = 69909840. Its totient is φ = 66373440.

The previous prime is 68138999. The next prime is 68139083. The reversal of 68139007 is 70093186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68139007 - 2³ = 68138999 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 (68139107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46969 + ... + 48397.

It is an arithmetic number, because the mean of its divisors is an integer number (8738730).

Almost surely, 2^68139007 is an apocalyptic number.

68139007 is a deficient number, since it is larger than the sum of its proper divisors (1770833).

68139007 is a wasteful number, since it uses less digits than its factorization.

68139007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 68139007 is about 8254.6354855923. The cubic root of 68139007 is about 408.4434476690.

The spelling of 68139007 in words is "sixty-eight million, one hundred thirty-nine thousand, seven".