68136815 has 8 divisors (see below), whose sum is σ = 81878688. Its totient is φ = 54433120.

The previous prime is 68136797. The next prime is 68136823. The reversal of 68136815 is 51863186.

It is a happy number.

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

It is not a de Polignac number, because 68136815 - 2⁸ = 68136559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5456 + ... + 12885.

It is an arithmetic number, because the mean of its divisors is an integer number (10234836).

Almost surely, 2^68136815 is an apocalyptic number.

68136815 is a deficient number, since it is larger than the sum of its proper divisors (13741873).

68136815 is a wasteful number, since it uses less digits than its factorization.

68136815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089.

The product of its digits is 34560, while the sum is 38.

The square root of 68136815 is about 8254.5027106422. The cubic root of 68136815 is about 408.4390678104.

The spelling of 68136815 in words is "sixty-eight million, one hundred thirty-six thousand, eight hundred fifteen".