90818 has 16 divisors (see below), whose sum is σ = 168000. Its totient is φ = 35856.

The previous prime is 90803. The next prime is 90821. The reversal of 90818 is 81809.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68 + ... + 431.

It is an arithmetic number, because the mean of its divisors is an integer number (10500).

2⁹⁰⁸¹⁸ is an apocalyptic number.

90818 is a deficient number, since it is larger than the sum of its proper divisors (77182).

90818 is a wasteful number, since it uses less digits than its factorization.

90818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 90818 is about 301.3602495353. The cubic root of 90818 is about 44.9494081634.

Subtracting from 90818 its reverse (81809), we obtain a palindrome (9009).

The spelling of 90818 in words is "ninety thousand, eight hundred eighteen".