90045220 has 12 divisors (see below), whose sum is σ = 189095004. Its totient is φ = 36018080.

The previous prime is 90045217. The next prime is 90045229. The reversal of 90045220 is 2254009.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68161536 + 21883684 = 8256^2 + 4678^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90045191 and 90045200.

It is not an unprimeable number, because it can be changed into a prime (90045229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2251111 + ... + 2251150.

It is an arithmetic number, because the mean of its divisors is an integer number (15757917).

Almost surely, 2^90045220 is an apocalyptic number.

It is an amenable number.

90045220 is an abundant number, since it is smaller than the sum of its proper divisors (99049784).

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

90045220 is a wasteful number, since it uses less digits than its factorization.

90045220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502270 (or 4502268 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 90045220 is about 9489.2159844742. The cubic root of 90045220 is about 448.2155173195.

Adding to 90045220 its reverse (2254009), we get a palindrome (92299229).

The spelling of 90045220 in words is "ninety million, forty-five thousand, two hundred twenty".