78779 has 2 divisors, whose sum is σ = 78780. Its totient is φ = 78778.

The previous prime is 78737. The next prime is 78781. The reversal of 78779 is 97787.

It is a strong prime.

It is an emirp because it is prime and its reverse (97787) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78779 is a prime.

It is a super-2 number, since 2×78779² = 12412261682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 78781, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (78079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39389 + 39390.

It is an arithmetic number, because the mean of its divisors is an integer number (39390).

2⁷⁸⁷⁷⁹ is an apocalyptic number.

78779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78779 is an equidigital number, since it uses as much as digits as its factorization.

78779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 38.

The square root of 78779 is about 280.6759697587. The cubic root of 78779 is about 42.8683552674.

The spelling of 78779 in words is "seventy-eight thousand, seven hundred seventy-nine".