68806813 has 2 divisors, whose sum is σ = 68806814. Its totient is φ = 68806812.

The previous prime is 68806811. The next prime is 68806817. The reversal of 68806813 is 31860886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65577604 + 3229209 = 8098^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 68806813 - 2¹ = 68806811 is a prime.

Together with 68806811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68806811) 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, 34403406 + 34403407.

It is an arithmetic number, because the mean of its divisors is an integer number (34403407).

Almost surely, 2^68806813 is an apocalyptic number.

It is an amenable number.

68806813 is a deficient number, since it is larger than the sum of its proper divisors (1).

68806813 is an equidigital number, since it uses as much as digits as its factorization.

68806813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 68806813 is about 8294.9872212078. The cubic root of 68806813 is about 409.7734481082.

The spelling of 68806813 in words is "sixty-eight million, eight hundred six thousand, eight hundred thirteen".