76771809 has 12 divisors (see below), whose sum is σ = 111231952. Its totient is φ = 51024600.

The previous prime is 76771777. The next prime is 76771823. The reversal of 76771809 is 90817767.

It is a happy number.

It is not a de Polignac number, because 76771809 - 2⁵ = 76771777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76771829) 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 in 11 ways as a sum of consecutive naturals, for example, 9907 + ... + 15864.

Almost surely, 2^76771809 is an apocalyptic number.

It is an amenable number.

76771809 is a deficient number, since it is larger than the sum of its proper divisors (34460143).

76771809 is a wasteful number, since it uses less digits than its factorization.

76771809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26108 (or 26105 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 76771809 is about 8761.9523509318. The cubic root of 76771809 is about 425.0114119196.

The spelling of 76771809 in words is "seventy-six million, seven hundred seventy-one thousand, eight hundred nine".