68138917 has 8 divisors (see below), whose sum is σ = 84952512. Its totient is φ = 53095200.

The previous prime is 68138909. The next prime is 68138927. The reversal of 68138917 is 71983186.

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 68138917 - 2³ = 68138909 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 (68138927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442384 + ... + 442537.

It is an arithmetic number, because the mean of its divisors is an integer number (10619064).

Almost surely, 2^68138917 is an apocalyptic number.

It is an amenable number.

68138917 is a deficient number, since it is larger than the sum of its proper divisors (16813595).

68138917 is a wasteful number, since it uses less digits than its factorization.

68138917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884939.

The product of its digits is 72576, while the sum is 43.

The square root of 68138917 is about 8254.6300341081. The cubic root of 68138917 is about 408.4432678408.

The spelling of 68138917 in words is "sixty-eight million, one hundred thirty-eight thousand, nine hundred seventeen".