79998 has 16 divisors (see below), whose sum is σ = 163200. Its totient is φ = 26136.

The previous prime is 79997. The next prime is 79999. The reversal of 79998 is 89997.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79997) and next prime (79999).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 79998.

It is not an unprimeable number, because it can be changed into a prime (79997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303 + ... + 501.

It is an arithmetic number, because the mean of its divisors is an integer number (10200).

2⁷⁹⁹⁹⁸ is an apocalyptic number.

79998 is an abundant number, since it is smaller than the sum of its proper divisors (83202).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81600).

79998 is a wasteful number, since it uses less digits than its factorization.

79998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its digits is 40824, while the sum is 42.

The square root of 79998 is about 282.8391769186. The cubic root of 79998 is about 43.0883347252.

Subtracting 79998 from its reverse (89997), we obtain a palindrome (9999).

The spelling of 79998 in words is "seventy-nine thousand, nine hundred ninety-eight".