77115685 has 4 divisors (see below), whose sum is σ = 92538828. Its totient is φ = 61692544.

The previous prime is 77115683. The next prime is 77115691. The reversal of 77115685 is 58651177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58651177 = 13 ⋅4511629.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 61449921 = 3958^2 + 7839^2 .

It is a cyclic number.

It is not a de Polignac number, because 77115685 - 2¹ = 77115683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77115683) 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 3 ways as a sum of consecutive naturals, for example, 7711564 + ... + 7711573.

It is an arithmetic number, because the mean of its divisors is an integer number (23134707).

Almost surely, 2^77115685 is an apocalyptic number.

It is an amenable number.

77115685 is a deficient number, since it is larger than the sum of its proper divisors (15423143).

77115685 is a wasteful number, since it uses less digits than its factorization.

77115685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15423142.

The product of its digits is 58800, while the sum is 40.

The square root of 77115685 is about 8781.5536780230. The cubic root of 77115685 is about 425.6450366587.

The spelling of 77115685 in words is "seventy-seven million, one hundred fifteen thousand, six hundred eighty-five".