68138605 has 8 divisors (see below), whose sum is σ = 81937152. Its totient is φ = 54397008.

The previous prime is 68138593. The next prime is 68138633. The reversal of 68138605 is 50683186.

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 68138605 - 2⁵ = 68138573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11557 + ... + 16426.

It is an arithmetic number, because the mean of its divisors is an integer number (10242144).

Almost surely, 2^68138605 is an apocalyptic number.

It is an amenable number.

68138605 is a deficient number, since it is larger than the sum of its proper divisors (13798547).

68138605 is a wasteful number, since it uses less digits than its factorization.

68138605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28475.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 68138605 is about 8254.6111356017. The cubic root of 68138605 is about 408.4426444355.

The spelling of 68138605 in words is "sixty-eight million, one hundred thirty-eight thousand, six hundred five".