79982779 has 2 divisors, whose sum is σ = 79982780. Its totient is φ = 79982778.

The previous prime is 79982743. The next prime is 79982801. The reversal of 79982779 is 97728997.

It is a strong prime.

It is an emirp because it is prime and its reverse (97728997) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79982779 is a prime.

It is not a weakly prime, because it can be changed into another prime (79982729) 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, 39991389 + 39991390.

It is an arithmetic number, because the mean of its divisors is an integer number (39991390).

Almost surely, 2^79982779 is an apocalyptic number.

79982779 is a deficient number, since it is larger than the sum of its proper divisors (1).

79982779 is an equidigital number, since it uses as much as digits as its factorization.

79982779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 58.

The square root of 79982779 is about 8943.3091750202. The cubic root of 79982779 is about 430.8560178545.

The spelling of 79982779 in words is "seventy-nine million, nine hundred eighty-two thousand, seven hundred seventy-nine".