68776913 has 2 divisors, whose sum is σ = 68776914. Its totient is φ = 68776912.

The previous prime is 68776891. The next prime is 68776937. The reversal of 68776913 is 31967786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53465344 + 15311569 = 7312^2 + 3913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68776913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68776943) 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, 34388456 + 34388457.

It is an arithmetic number, because the mean of its divisors is an integer number (34388457).

Almost surely, 2^68776913 is an apocalyptic number.

It is an amenable number.

68776913 is a deficient number, since it is larger than the sum of its proper divisors (1).

68776913 is an equidigital number, since it uses as much as digits as its factorization.

68776913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 68776913 is about 8293.1847320556. The cubic root of 68776913 is about 409.7140838256.

The spelling of 68776913 in words is "sixty-eight million, seven hundred seventy-six thousand, nine hundred thirteen".