85998 has 16 divisors (see below), whose sum is σ = 187776. Its totient is φ = 26040.

The previous prime is 85991. The next prime is 85999. The reversal of 85998 is 89958.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85991) 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, 586 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (11736).

2⁸⁵⁹⁹⁸ is an apocalyptic number.

85998 is an abundant number, since it is smaller than the sum of its proper divisors (101778).

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 (93888).

85998 is a wasteful number, since it uses less digits than its factorization.

85998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319.

The product of its digits is 25920, while the sum is 39.

The square root of 85998 is about 293.2541559808. The cubic root of 85998 is about 44.1397074508.

It can be divided in two parts, 8 and 5998, that added together give a palindrome (6006).

The spelling of 85998 in words is "eighty-five thousand, nine hundred ninety-eight".