68136878 has 8 divisors (see below), whose sum is σ = 103881000. Its totient is φ = 33509880.

The previous prime is 68136877. The next prime is 68136911. The reversal of 68136878 is 87863186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68136877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279128 + ... + 279371.

It is an arithmetic number, because the mean of its divisors is an integer number (12985125).

Almost surely, 2^68136878 is an apocalyptic number.

68136878 is a deficient number, since it is larger than the sum of its proper divisors (35744122).

68136878 is a wasteful number, since it uses less digits than its factorization.

68136878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558562.

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

The square root of 68136878 is about 8254.5065267404. The cubic root of 68136878 is about 408.4391936927.

The spelling of 68136878 in words is "sixty-eight million, one hundred thirty-six thousand, eight hundred seventy-eight".