77684669 has 2 divisors, whose sum is σ = 77684670. Its totient is φ = 77684668.

The previous prime is 77684653. The next prime is 77684683. The reversal of 77684669 is 96648677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76772644 + 912025 = 8762^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 77684669 - 2⁴ = 77684653 is a prime.

It is a super-2 number, since 2×77684669² = 12069815595279122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77684669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77684609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38842334 + 38842335.

It is an arithmetic number, because the mean of its divisors is an integer number (38842335).

Almost surely, 2^77684669 is an apocalyptic number.

It is an amenable number.

77684669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77684669 is an equidigital number, since it uses as much as digits as its factorization.

77684669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 53.

The square root of 77684669 is about 8813.8906845955. The cubic root of 77684669 is about 426.6893205609.

The spelling of 77684669 in words is "seventy-seven million, six hundred eighty-four thousand, six hundred sixty-nine".