90288009 has 24 divisors (see below), whose sum is σ = 149303232. Its totient is φ = 51504480.

The previous prime is 90288001. The next prime is 90288043. The reversal of 90288009 is 90088209.

It is not a de Polignac number, because 90288009 - 2³ = 90288001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90288001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58522 + ... + 60044.

It is an arithmetic number, because the mean of its divisors is an integer number (6220968).

Almost surely, 2^90288009 is an apocalyptic number.

It is an amenable number.

90288009 is a deficient number, since it is larger than the sum of its proper divisors (59015223).

90288009 is a wasteful number, since it uses less digits than its factorization.

90288009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 90288009 is about 9502.0002631025. Note that the first 3 decimals coincide. The cubic root of 90288009 is about 448.6179970885.

The spelling of 90288009 in words is "ninety million, two hundred eighty-eight thousand, nine".