77677679 has 2 divisors, whose sum is σ = 77677680. Its totient is φ = 77677678.

The previous prime is 77677609. The next prime is 77677711. The reversal of 77677679 is 97677677.

It is a strong prime.

It is an emirp because it is prime and its reverse (97677677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77677679 - 2²⁰ = 76629103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77677609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38838839 + 38838840.

It is an arithmetic number, because the mean of its divisors is an integer number (38838840).

Almost surely, 2^77677679 is an apocalyptic number.

77677679 is a deficient number, since it is larger than the sum of its proper divisors (1).

77677679 is an equidigital number, since it uses as much as digits as its factorization.

77677679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5445468, while the sum is 56.

The square root of 77677679 is about 8813.4941425067. The cubic root of 77677679 is about 426.6765224638.

The spelling of 77677679 in words is "seventy-seven million, six hundred seventy-seven thousand, six hundred seventy-nine".