77600809 has 12 divisors (see below), whose sum is σ = 91859908. Its totient is φ = 65118240.

The previous prime is 77600749. The next prime is 77600819. The reversal of 77600809 is 90800677.

It can be written as a sum of positive squares in 2 ways, for example, as 51437584 + 26163225 = 7172^2 + 5115^2 .

It is not a de Polignac number, because 77600809 - 2⁹ = 77600297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77600819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23094 + ... + 26239.

Almost surely, 2^77600809 is an apocalyptic number.

It is an amenable number.

77600809 is a deficient number, since it is larger than the sum of its proper divisors (14259099).

77600809 is a wasteful number, since it uses less digits than its factorization.

77600809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49368 (or 49357 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 77600809 is about 8809.1321365955. The cubic root of 77600809 is about 426.5357293392.

The spelling of 77600809 in words is "seventy-seven million, six hundred thousand, eight hundred nine".