77568669 has 12 divisors (see below), whose sum is σ = 113199996. Its totient is φ = 51178752.

The previous prime is 77568643. The next prime is 77568677. The reversal of 77568669 is 96686577.

It is a happy number.

77568669 is a `hidden beast` number, since 77 + 568 + 6 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63393444 + 14175225 = 7962^2 + 3765^2 .

It is not a de Polignac number, because 77568669 - 2⁹ = 77568157 is a prime.

It is a super-2 number, since 2×77568669² = 12033796820863122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77561669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43554 + ... + 45299.

It is an arithmetic number, because the mean of its divisors is an integer number (9433333).

Almost surely, 2^77568669 is an apocalyptic number.

It is an amenable number.

77568669 is a deficient number, since it is larger than the sum of its proper divisors (35631327).

77568669 is a wasteful number, since it uses less digits than its factorization.

77568669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88956 (or 88953 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 77568669 is about 8807.3077044009. The cubic root of 77568669 is about 426.4768349730.

The spelling of 77568669 in words is "seventy-seven million, five hundred sixty-eight thousand, six hundred sixty-nine".