90233220 has 96 divisors (see below), whose sum is σ = 315012096. Its totient is φ = 18748800.

The previous prime is 90233191. The next prime is 90233233. The reversal of 90233220 is 2233209.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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, 5146 + ... + 14385.

It is an arithmetic number, because the mean of its divisors is an integer number (3281376).

Almost surely, 2^90233220 is an apocalyptic number.

It is an amenable number.

90233220 is an abundant number, since it is smaller than the sum of its proper divisors (224778876).

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

90233220 is a wasteful number, since it uses less digits than its factorization.

90233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561 (or 19559 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 90233220 is about 9499.1168010505. The cubic root of 90233220 is about 448.5272345566.

Adding to 90233220 its reverse (2233209), we get a palindrome (92466429).

Subtracting from 90233220 its reverse (2233209), we obtain a triangular number (88000011 = T₁₃₂₆₆).

The spelling of 90233220 in words is "ninety million, two hundred thirty-three thousand, two hundred twenty".