68908681 has 4 divisors (see below), whose sum is σ = 68927872. Its totient is φ = 68889492.

The previous prime is 68908663. The next prime is 68908717. The reversal of 68908681 is 18680986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68908681 - 2¹¹ = 68906633 is a prime.

It is a super-2 number, since 2×68908681² = 9496812634319522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68908181) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2421 + ... + 11986.

It is an arithmetic number, because the mean of its divisors is an integer number (17231968).

Almost surely, 2^68908681 is an apocalyptic number.

It is an amenable number.

68908681 is a deficient number, since it is larger than the sum of its proper divisors (19191).

68908681 is a wasteful number, since it uses less digits than its factorization.

68908681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 68908681 is about 8301.1252851647. The cubic root of 68908681 is about 409.9755706245.

The spelling of 68908681 in words is "sixty-eight million, nine hundred eight thousand, six hundred eighty-one".