9090144 has 144 divisors (see below), whose sum is σ = 30820608. Its totient is φ = 2581632.

The previous prime is 9090139. The next prime is 9090173. The reversal of 9090144 is 4410909.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54349 + ... + 54515.

It is an arithmetic number, because the mean of its divisors is an integer number (214032).

Almost surely, 2^9090144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9090144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15410304).

9090144 is an abundant number, since it is smaller than the sum of its proper divisors (21730464).

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

9090144 is a wasteful number, since it uses less digits than its factorization.

9090144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 9090144 is about 3014.9865671343. The cubic root of 9090144 is about 208.7005471678.

The spelling of 9090144 in words is "nine million, ninety thousand, one hundred forty-four".