68678615 has 4 divisors (see below), whose sum is σ = 82414344. Its totient is φ = 54942888.

The previous prime is 68678573. The next prime is 68678647. The reversal of 68678615 is 51687686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68678615 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68678615.

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 3 ways as a sum of consecutive naturals, for example, 6867857 + ... + 6867866.

It is an arithmetic number, because the mean of its divisors is an integer number (20603586).

Almost surely, 2^68678615 is an apocalyptic number.

68678615 is a deficient number, since it is larger than the sum of its proper divisors (13735729).

68678615 is a wasteful number, since it uses less digits than its factorization.

68678615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13735728.

The product of its digits is 483840, while the sum is 47.

The square root of 68678615 is about 8287.2561804255. The cubic root of 68678615 is about 409.5187989281.

The spelling of 68678615 in words is "sixty-eight million, six hundred seventy-eight thousand, six hundred fifteen".