68688685 has 16 divisors (see below), whose sum is σ = 90276480. Its totient is φ = 49861440.

The previous prime is 68688679. The next prime is 68688703. The reversal of 68688685 is 58688686.

It is not a de Polignac number, because 68688685 - 2¹¹ = 68686637 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 5121 + ... + 12790.

It is an arithmetic number, because the mean of its divisors is an integer number (5642280).

Almost surely, 2^68688685 is an apocalyptic number.

68688685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68688685 is a deficient number, since it is larger than the sum of its proper divisors (21587795).

68688685 is a wasteful number, since it uses less digits than its factorization.

68688685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17988.

The product of its digits is 4423680, while the sum is 55.

The square root of 68688685 is about 8287.8637175089. The cubic root of 68688685 is about 409.5388131774.

Subtracting from 68688685 its reverse (58688686), we obtain a palindrome (9999999).

The spelling of 68688685 in words is "sixty-eight million, six hundred eighty-eight thousand, six hundred eighty-five".