77685909 has 8 divisors (see below), whose sum is σ = 118378560. Its totient is φ = 44391936.

The previous prime is 77685871. The next prime is 77685911. The reversal of 77685909 is 90958677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77685909 - 2⁹ = 77685397 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77685919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849644 + ... + 1849685.

It is an arithmetic number, because the mean of its divisors is an integer number (14797320).

Almost surely, 2^77685909 is an apocalyptic number.

It is an amenable number.

77685909 is a deficient number, since it is larger than the sum of its proper divisors (40692651).

77685909 is a wasteful number, since it uses less digits than its factorization.

77685909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699339.

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 77685909 is about 8813.9610278240. The cubic root of 77685909 is about 426.6915908156.

The spelling of 77685909 in words is "seventy-seven million, six hundred eighty-five thousand, nine hundred nine".