68131808 has 12 divisors (see below), whose sum is σ = 134134560. Its totient is φ = 34065888.

The previous prime is 68131799. The next prime is 68131879. The reversal of 68131808 is 80813186.

It is a happy number.

It is a super-2 number, since 2×68131808² = 9283886522697728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064528 + ... + 1064591.

It is an arithmetic number, because the mean of its divisors is an integer number (11177880).

Almost surely, 2^68131808 is an apocalyptic number.

It is an amenable number.

68131808 is a deficient number, since it is larger than the sum of its proper divisors (66002752).

68131808 is a wasteful number, since it uses less digits than its factorization.

68131808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129129 (or 2129121 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 68131808 is about 8254.1994160548. The cubic root of 68131808 is about 408.4290629180.

The spelling of 68131808 in words is "sixty-eight million, one hundred thirty-one thousand, eight hundred eight".