77688685 has 16 divisors (see below), whose sum is σ = 95351040. Its totient is φ = 60747840.

The previous prime is 77688683. The next prime is 77688703. The reversal of 77688685 is 58688677.

It is not a de Polignac number, because 77688685 - 2¹ = 77688683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77688683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53884 + ... + 55306.

It is an arithmetic number, because the mean of its divisors is an integer number (5959440).

Almost surely, 2^77688685 is an apocalyptic number.

It is an amenable number.

77688685 is a deficient number, since it is larger than the sum of its proper divisors (17662355).

77688685 is a wasteful number, since it uses less digits than its factorization.

77688685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

The product of its digits is 4515840, while the sum is 55.

The square root of 77688685 is about 8814.1185038551. The cubic root of 77688685 is about 426.6966731691.

The spelling of 77688685 in words is "seventy-seven million, six hundred eighty-eight thousand, six hundred eighty-five".