68029681 has 2 divisors, whose sum is σ = 68029682. Its totient is φ = 68029680.

The previous prime is 68029673. The next prime is 68029691. The reversal of 68029681 is 18692086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67914081 + 115600 = 8241^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 68029681 - 2³ = 68029673 is a prime.

It is a super-2 number, since 2×68029681² = 9256074993923522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68029601) by changing a digit.

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 as a sum of consecutive naturals, namely, 34014840 + 34014841.

It is an arithmetic number, because the mean of its divisors is an integer number (34014841).

Almost surely, 2^68029681 is an apocalyptic number.

68029681 is the 5217-th centered pentagonal number.

It is an amenable number.

68029681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68029681 is an equidigital number, since it uses as much as digits as its factorization.

68029681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 68029681 is about 8248.0107298669. The cubic root of 68029681 is about 408.2248876344.

The spelling of 68029681 in words is "sixty-eight million, twenty-nine thousand, six hundred eighty-one".