77679857 has 2 divisors, whose sum is σ = 77679858. Its totient is φ = 77679856.

The previous prime is 77679827. The next prime is 77679859. The reversal of 77679857 is 75897677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 7639696 = 8369^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 77679857 - 2⁸ = 77679601 is a prime.

Together with 77679859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77679859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38839928 + 38839929.

It is an arithmetic number, because the mean of its divisors is an integer number (38839929).

Almost surely, 2^77679857 is an apocalyptic number.

It is an amenable number.

77679857 is a deficient number, since it is larger than the sum of its proper divisors (1).

77679857 is an equidigital number, since it uses as much as digits as its factorization.

77679857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5186160, while the sum is 56.

The square root of 77679857 is about 8813.6177021698. The cubic root of 77679857 is about 426.6805102794.

The spelling of 77679857 in words is "seventy-seven million, six hundred seventy-nine thousand, eight hundred fifty-seven".