90009200 has 30 divisors (see below), whose sum is σ = 216248064. Its totient is φ = 36003520.

The previous prime is 90009187. The next prime is 90009209. The reversal of 90009200 is 290009.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90009209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112112 + ... + 112911.

Almost surely, 2^90009200 is an apocalyptic number.

It is an amenable number.

90009200 is an abundant number, since it is smaller than the sum of its proper divisors (126238864).

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

90009200 is a wasteful number, since it uses less digits than its factorization.

90009200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225041 (or 225030 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 90009200 is about 9487.3178506889. The cubic root of 90009200 is about 448.1557441072.

Adding to 90009200 its reverse (290009), we get a palindrome (90299209).

It can be divided in two parts, 90009 and 200, that added together give a palindrome (90209).

The spelling of 90009200 in words is "ninety million, nine thousand, two hundred".