90808 has 8 divisors (see below), whose sum is σ = 170280. Its totient is φ = 45400.

The previous prime is 90803. The next prime is 90821. The reversal of 90808 is 80809.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90803) by changing a digit.

90808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5668 + ... + 5683.

It is an arithmetic number, because the mean of its divisors is an integer number (21285).

2⁹⁰⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

90808 is a deficient number, since it is larger than the sum of its proper divisors (79472).

90808 is a wasteful number, since it uses less digits than its factorization.

90808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11357 (or 11353 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 90808 is about 301.3436576402. The cubic root of 90808 is about 44.9477583047.

Subtracting from 90808 its reverse (80809), we obtain a palindrome (9999).

It can be divided in two parts, 90 and 808, that added together give a palindrome (898).

The spelling of 90808 in words is "ninety thousand, eight hundred eight".