68138719 has 32 divisors (see below), whose sum is σ = 82736640. Its totient is φ = 55440000.

The previous prime is 68138701. The next prime is 68138729. The reversal of 68138719 is 91783186.

It is not a de Polignac number, because 68138719 - 2⁹ = 68138207 is a prime.

It is a super-2 number, since 2×68138719² = 9285770053921922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68138729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271344 + ... + 271594.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^68138719 is an apocalyptic number.

68138719 is a deficient number, since it is larger than the sum of its proper divisors (14597921).

68138719 is a wasteful number, since it uses less digits than its factorization.

68138719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

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

The square root of 68138719 is about 8254.6180408302. The cubic root of 68138719 is about 408.4428722184.

The spelling of 68138719 in words is "sixty-eight million, one hundred thirty-eight thousand, seven hundred nineteen".