68940081 has 24 divisors (see below), whose sum is σ = 114033920. Its totient is φ = 39315456.

The previous prime is 68940041. The next prime is 68940089. The reversal of 68940081 is 18004986.

It is a happy number.

It is not a de Polignac number, because 68940081 - 2⁶ = 68940017 is a prime.

It is a super-2 number, since 2×68940081² = 9505469536573122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68940089) 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 23 ways as a sum of consecutive naturals, for example, 47736 + ... + 49158.

Almost surely, 2^68940081 is an apocalyptic number.

It is an amenable number.

68940081 is a deficient number, since it is larger than the sum of its proper divisors (45093839).

68940081 is a wasteful number, since it uses less digits than its factorization.

68940081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205 (or 2202 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 68940081 is about 8303.0163796057. The cubic root of 68940081 is about 410.0378331140.

The spelling of 68940081 in words is "sixty-eight million, nine hundred forty thousand, eighty-one".