67819813 has 2 divisors, whose sum is σ = 67819814. Its totient is φ = 67819812.

The previous prime is 67819757. The next prime is 67819819. The reversal of 67819813 is 31891876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66863329 + 956484 = 8177^2 + 978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67819813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67819813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67819819) 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, 33909906 + 33909907.

It is an arithmetic number, because the mean of its divisors is an integer number (33909907).

Almost surely, 2^67819813 is an apocalyptic number.

It is an amenable number.

67819813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67819813 is an equidigital number, since it uses as much as digits as its factorization.

67819813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 67819813 is about 8235.2785623803. The cubic root of 67819813 is about 407.8046710955.

The spelling of 67819813 in words is "sixty-seven million, eight hundred nineteen thousand, eight hundred thirteen".