90288209 has 8 divisors (see below), whose sum is σ = 103680480. Its totient is φ = 77760000.

The previous prime is 90288197. The next prime is 90288217.

90288209 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90288209 - 2⁴ = 90288193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90288259) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 215792 + ... + 216209.

It is an arithmetic number, because the mean of its divisors is an integer number (12960060).

Almost surely, 2^90288209 is an apocalyptic number.

It is an amenable number.

90288209 is a deficient number, since it is larger than the sum of its proper divisors (13392271).

90288209 is a wasteful number, since it uses less digits than its factorization.

90288209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432031.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 90288209 is about 9502.0107871966. The cubic root of 90288209 is about 448.6183283379.

The spelling of 90288209 in words is "ninety million, two hundred eighty-eight thousand, two hundred nine".