77679517 has 2 divisors, whose sum is σ = 77679518. Its totient is φ = 77679516.

The previous prime is 77679491. The next prime is 77679523. The reversal of 77679517 is 71597677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77633721 + 45796 = 8811^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 77679517 - 2¹¹ = 77677469 is a prime.

It is a super-2 number, since 2×77679517² = 12068214722706578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77679527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38839758 + 38839759.

It is an arithmetic number, because the mean of its divisors is an integer number (38839759).

Almost surely, 2^77679517 is an apocalyptic number.

It is an amenable number.

77679517 is a deficient number, since it is larger than the sum of its proper divisors (1).

77679517 is an equidigital number, since it uses as much as digits as its factorization.

77679517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648270, while the sum is 49.

The square root of 77679517 is about 8813.5984138149. The cubic root of 77679517 is about 426.6798877603.

The spelling of 77679517 in words is "seventy-seven million, six hundred seventy-nine thousand, five hundred seventeen".