68138818 has 16 divisors (see below), whose sum is σ = 112150656. Its totient is φ = 30791440.

The previous prime is 68138813. The next prime is 68138821. The reversal of 68138818 is 81883186.

It is not an unprimeable number, because it can be changed into a prime (68138813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5146 + ... + 12757.

It is an arithmetic number, because the mean of its divisors is an integer number (7009416).

Almost surely, 2^68138818 is an apocalyptic number.

68138818 is a deficient number, since it is larger than the sum of its proper divisors (44011838).

68138818 is a wasteful number, since it uses less digits than its factorization.

68138818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18089.

The product of its digits is 73728, while the sum is 43.

The square root of 68138818 is about 8254.6240374714. The cubic root of 68138818 is about 408.4430700297.

The spelling of 68138818 in words is "sixty-eight million, one hundred thirty-eight thousand, eight hundred eighteen".