79866 has 40 divisors (see below), whose sum is σ = 196020. Its totient is φ = 24192.

The previous prime is 79861. The next prime is 79867. The reversal of 79866 is 66897.

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 2025 = 279^2 + 45^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79866.

It is not an unprimeable number, because it can be changed into a prime (79861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2740 + ... + 2768.

2⁷⁹⁸⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98010).

79866 is an abundant number, since it is smaller than the sum of its proper divisors (116154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79866 is a wasteful number, since it uses less digits than its factorization.

79866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 51 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 79866 is about 282.6057324259. The cubic root of 79866 is about 43.0646225018.

The spelling of 79866 in words is "seventy-nine thousand, eight hundred sixty-six".