79779 has 16 divisors (see below), whose sum is σ = 126720. Its totient is φ = 43680.

The previous prime is 79777. The next prime is 79801. The reversal of 79779 is 97797.

It is not a de Polignac number, because 79779 - 2¹ = 79777 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (7920).

2⁷⁹⁷⁷⁹ is an apocalyptic number.

79779 is a deficient number, since it is larger than the sum of its proper divisors (46941).

79779 is a wasteful number, since it uses less digits than its factorization.

79779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170.

The product of its digits is 27783, while the sum is 39.

The square root of 79779 is about 282.4517657937. The cubic root of 79779 is about 43.0489797025.

It can be divided in two parts, 79 and 779, that added together give a palindrome (858).

The spelling of 79779 in words is "seventy-nine thousand, seven hundred seventy-nine".