68672081 has 2 divisors, whose sum is σ = 68672082. Its totient is φ = 68672080.

The previous prime is 68672077. The next prime is 68672083. The reversal of 68672081 is 18027686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 15673681 = 7280^2 + 3959^2 .

It is a cyclic number.

It is not a de Polignac number, because 68672081 - 2² = 68672077 is a prime.

It is a super-2 number, since 2×68672081² = 9431709417741122, which contains 22 as substring.

Together with 68672083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68672083) 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 as a sum of consecutive naturals, namely, 34336040 + 34336041.

It is an arithmetic number, because the mean of its divisors is an integer number (34336041).

Almost surely, 2^68672081 is an apocalyptic number.

It is an amenable number.

68672081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68672081 is an equidigital number, since it uses as much as digits as its factorization.

68672081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 68672081 is about 8286.8619513058. The cubic root of 68672081 is about 409.5058114758.

The spelling of 68672081 in words is "sixty-eight million, six hundred seventy-two thousand, eighty-one".