90210 has 32 divisors (see below), whose sum is σ = 225792. Its totient is φ = 23040.

The previous prime is 90203. The next prime is 90217. The reversal of 90210 is 1209.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90203) and next prime (90217).

It is not an unprimeable number, because it can be changed into a prime (90217) by changing a digit.

90210 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 in 15 ways as a sum of consecutive naturals, for example, 882 + ... + 978.

It is an arithmetic number, because the mean of its divisors is an integer number (7056).

2⁹⁰²¹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112896).

90210 is an abundant number, since it is smaller than the sum of its proper divisors (135582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90210 is a wasteful number, since it uses less digits than its factorization.

90210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 90210 is about 300.3497960712. The cubic root of 90210 is about 44.8488757612.

Adding to 90210 its reverse (1209), we get a palindrome (91419).

It can be divided in two parts, 90 and 210, that added together give a triangular number (300 = T₂₄).

The spelling of 90210 in words is "ninety thousand, two hundred ten".