68138678 has 4 divisors (see below), whose sum is σ = 102208020. Its totient is φ = 34069338.

The previous prime is 68138671. The next prime is 68138683. The reversal of 68138678 is 87683186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87683186 = 2 ⋅43841593.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68138671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17034668 + ... + 17034671.

It is an arithmetic number, because the mean of its divisors is an integer number (25552005).

Almost surely, 2^68138678 is an apocalyptic number.

68138678 is a deficient number, since it is larger than the sum of its proper divisors (34069342).

68138678 is a wasteful number, since it uses less digits than its factorization.

68138678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34069341.

The product of its digits is 387072, while the sum is 47.

The square root of 68138678 is about 8254.6155573715. The cubic root of 68138678 is about 408.4427902965.

The spelling of 68138678 in words is "sixty-eight million, one hundred thirty-eight thousand, six hundred seventy-eight".