76808209 has 2 divisors, whose sum is σ = 76808210. Its totient is φ = 76808208.

The previous prime is 76808119. The next prime is 76808213. The reversal of 76808209 is 90280867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 35141184 = 6455^2 + 5928^2 .

It is an emirp because it is prime and its reverse (90280867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76808209 - 2¹⁷ = 76677137 is a prime.

It is not a weakly prime, because it can be changed into another prime (76808299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38404104 + 38404105.

It is an arithmetic number, because the mean of its divisors is an integer number (38404105).

Almost surely, 2^76808209 is an apocalyptic number.

It is an amenable number.

76808209 is a deficient number, since it is larger than the sum of its proper divisors (1).

76808209 is an equidigital number, since it uses as much as digits as its factorization.

76808209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 76808209 is about 8764.0292674089. The cubic root of 76808209 is about 425.0785718630.

The spelling of 76808209 in words is "seventy-six million, eight hundred eight thousand, two hundred nine".