77956685 has 4 divisors (see below), whose sum is σ = 93548028. Its totient is φ = 62365344.

The previous prime is 77956667. The next prime is 77956687. The reversal of 77956685 is 58665977.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 60808804 = 4141^2 + 7798^2 .

It is a cyclic number.

It is not a de Polignac number, because 77956685 - 2⁸ = 77956429 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 (77956687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7795664 + ... + 7795673.

It is an arithmetic number, because the mean of its divisors is an integer number (23387007).

Almost surely, 2^77956685 is an apocalyptic number.

It is an amenable number.

77956685 is a deficient number, since it is larger than the sum of its proper divisors (15591343).

77956685 is a wasteful number, since it uses less digits than its factorization.

77956685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15591342.

The product of its digits is 3175200, while the sum is 53.

The square root of 77956685 is about 8829.3082968033. The cubic root of 77956685 is about 427.1867636915.

The spelling of 77956685 in words is "seventy-seven million, nine hundred fifty-six thousand, six hundred eighty-five".