67765813 has 2 divisors, whose sum is σ = 67765814. Its totient is φ = 67765812.

The previous prime is 67765801. The next prime is 67765829. The reversal of 67765813 is 31856776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55980324 + 11785489 = 7482^2 + 3433^2 .

It is a cyclic number.

It is not a de Polignac number, because 67765813 - 2⁵ = 67765781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67765813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67765013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33882906 + 33882907.

It is an arithmetic number, because the mean of its divisors is an integer number (33882907).

Almost surely, 2^67765813 is an apocalyptic number.

It is an amenable number.

67765813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67765813 is an equidigital number, since it uses as much as digits as its factorization.

67765813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 67765813 is about 8231.9993318756. Note that the first 3 decimals coincide. The cubic root of 67765813 is about 407.6964072586.

The spelling of 67765813 in words is "sixty-seven million, seven hundred sixty-five thousand, eight hundred thirteen".