68878342138 has 32 divisors (see below), whose sum is σ = 109760313600. Its totient is φ = 32326376256.

The previous prime is 68878342103. The next prime is 68878342139. The reversal of 68878342138 is 83124387886.

It is a super-2 number, since 2×68878342138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68878342139) 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 15 ways as a sum of consecutive naturals, for example, 1908303 + ... + 1944061.

It is an arithmetic number, because the mean of its divisors is an integer number (3430009800).

Almost surely, 2^68878342138 is an apocalyptic number.

68878342138 is a deficient number, since it is larger than the sum of its proper divisors (40881971462).

68878342138 is a wasteful number, since it uses less digits than its factorization.

68878342138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36246.

The product of its digits is 12386304, while the sum is 58.

The spelling of 68878342138 in words is "sixty-eight billion, eight hundred seventy-eight million, three hundred forty-two thousand, one hundred thirty-eight".