68688715 has 8 divisors (see below), whose sum is σ = 85085568. Its totient is φ = 53178240.

The previous prime is 68688709. The next prime is 68688769. The reversal of 68688715 is 51788686.

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

It is a de Polignac number, because none of the positive numbers 2^k-68688715 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221422 + ... + 221731.

It is an arithmetic number, because the mean of its divisors is an integer number (10635696).

Almost surely, 2^68688715 is an apocalyptic number.

68688715 is a deficient number, since it is larger than the sum of its proper divisors (16396853).

68688715 is a wasteful number, since it uses less digits than its factorization.

68688715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443189.

The product of its digits is 645120, while the sum is 49.

The square root of 68688715 is about 8287.8655273840. The cubic root of 68688715 is about 409.5388727998.

It can be divided in two parts, 686 and 88715, that added together give a square (89401 = 299²).

The spelling of 68688715 in words is "sixty-eight million, six hundred eighty-eight thousand, seven hundred fifteen".