79890 has 16 divisors (see below), whose sum is σ = 191808. Its totient is φ = 21296.

The previous prime is 79889. The next prime is 79901. The reversal of 79890 is 9897.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (11988).

2⁷⁹⁸⁹⁰ is an apocalyptic number.

79890 is an abundant number, since it is smaller than the sum of its proper divisors (111918).

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 (95904).

79890 is a wasteful number, since it uses less digits than its factorization.

79890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 79890 is about 282.6481912201. The cubic root of 79890 is about 43.0689357574.

It can be divided in two parts, 798 and 90, that added together give a palindrome (888).

The spelling of 79890 in words is "seventy-nine thousand, eight hundred ninety".