68081138 has 4 divisors (see below), whose sum is σ = 102121710. Its totient is φ = 34040568.

The previous prime is 68081137. The next prime is 68081213. The reversal of 68081138 is 83118086.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48958009 + 19123129 = 6997^2 + 4373^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68081098 and 68081107.

It is not an unprimeable number, because it can be changed into a prime (68081131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17020283 + ... + 17020286.

Almost surely, 2^68081138 is an apocalyptic number.

68081138 is a deficient number, since it is larger than the sum of its proper divisors (34040572).

68081138 is a wasteful number, since it uses less digits than its factorization.

68081138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34040571.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 68081138 is about 8251.1294984384. The cubic root of 68081138 is about 408.3277874947.

It can be divided in two parts, 680 and 81138, that added together give a palindrome (81818).

The spelling of 68081138 in words is "sixty-eight million, eighty-one thousand, one hundred thirty-eight".