90858 has 16 divisors (see below), whose sum is σ = 191520. Its totient is φ = 28656.

The previous prime is 90847. The next prime is 90863. The reversal of 90858 is 85809.

It is a Curzon number.

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, 285 + ... + 512.

It is an arithmetic number, because the mean of its divisors is an integer number (11970).

2⁹⁰⁸⁵⁸ is an apocalyptic number.

90858 is an abundant number, since it is smaller than the sum of its proper divisors (100662).

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 (95760).

90858 is a wasteful number, since it uses less digits than its factorization.

90858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 90858 is about 301.4266079828. The cubic root of 90858 is about 44.9560063870.

Subtracting from 90858 its product of nonzero digits (2880), we obtain a palindrome (87978).

The spelling of 90858 in words is "ninety thousand, eight hundred fifty-eight".