76668209 has 2 divisors, whose sum is σ = 76668210. Its totient is φ = 76668208.

The previous prime is 76668169. The next prime is 76668247. The reversal of 76668209 is 90286667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68939809 + 7728400 = 8303^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 76668209 - 2⁸ = 76667953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76668209.

It is not a weakly prime, because it can be changed into another prime (76668299) 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, 38334104 + 38334105.

It is an arithmetic number, because the mean of its divisors is an integer number (38334105).

Almost surely, 2^76668209 is an apocalyptic number.

It is an amenable number.

76668209 is a deficient number, since it is larger than the sum of its proper divisors (1).

76668209 is an equidigital number, since it uses as much as digits as its factorization.

76668209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 76668209 is about 8756.0384307060. The cubic root of 76668209 is about 424.8201481223.

The spelling of 76668209 in words is "seventy-six million, six hundred sixty-eight thousand, two hundred nine".