68121878 has 16 divisors (see below), whose sum is σ = 117339840. Its totient is φ = 29334600.

The previous prime is 68121877. The next prime is 68121901. The reversal of 68121878 is 87812186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68121877) 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, 81068 + ... + 81903.

It is an arithmetic number, because the mean of its divisors is an integer number (7333740).

Almost surely, 2^68121878 is an apocalyptic number.

68121878 is a deficient number, since it is larger than the sum of its proper divisors (49217962).

68121878 is a wasteful number, since it uses less digits than its factorization.

68121878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163003.

The product of its digits is 43008, while the sum is 41.

The square root of 68121878 is about 8253.5978821360. The cubic root of 68121878 is about 408.4092195303.

The spelling of 68121878 in words is "sixty-eight million, one hundred twenty-one thousand, eight hundred seventy-eight".