76770209 has 2 divisors, whose sum is σ = 76770210. Its totient is φ = 76770208.

The previous prime is 76770191. The next prime is 76770257. The reversal of 76770209 is 90207767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 5536609 = 8440^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 76770209 - 2¹² = 76766113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (76770299) 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, 38385104 + 38385105.

It is an arithmetic number, because the mean of its divisors is an integer number (38385105).

Almost surely, 2^76770209 is an apocalyptic number.

It is an amenable number.

76770209 is a deficient number, since it is larger than the sum of its proper divisors (1).

76770209 is an equidigital number, since it uses as much as digits as its factorization.

76770209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 76770209 is about 8761.8610466042. The cubic root of 76770209 is about 425.0084593472.

The spelling of 76770209 in words is "seventy-six million, seven hundred seventy thousand, two hundred nine".