90213530 has 64 divisors (see below), whose sum is σ = 184415616. Its totient is φ = 31488000.

The previous prime is 90213481. The next prime is 90213533. The reversal of 90213530 is 3531209.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90213496 and 90213505.

It is not an unprimeable number, because it can be changed into a prime (90213533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374210 + ... + 374450.

It is an arithmetic number, because the mean of its divisors is an integer number (2881494).

Almost surely, 2^90213530 is an apocalyptic number.

90213530 is an abundant number, since it is smaller than the sum of its proper divisors (94202086).

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

90213530 is a wasteful number, since it uses less digits than its factorization.

90213530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 90213530 is about 9498.0803323619. The cubic root of 90213530 is about 448.4946074609.

Adding to 90213530 its reverse (3531209), we get a palindrome (93744739).

The spelling of 90213530 in words is "ninety million, two hundred thirteen thousand, five hundred thirty".