77685117 has 4 divisors (see below), whose sum is σ = 103580160. Its totient is φ = 51790076.

The previous prime is 77685079. The next prime is 77685137. The reversal of 77685117 is 71158677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77685117 - 2⁷ = 77684989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77685137) 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 3 ways as a sum of consecutive naturals, for example, 12947517 + ... + 12947522.

It is an arithmetic number, because the mean of its divisors is an integer number (25895040).

Almost surely, 2^77685117 is an apocalyptic number.

It is an amenable number.

77685117 is a deficient number, since it is larger than the sum of its proper divisors (25895043).

77685117 is a wasteful number, since it uses less digits than its factorization.

77685117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25895042.

The product of its digits is 82320, while the sum is 42.

The square root of 77685117 is about 8813.9160989880. The cubic root of 77685117 is about 426.6901407848.

The spelling of 77685117 in words is "seventy-seven million, six hundred eighty-five thousand, one hundred seventeen".