90688209 has 8 divisors (see below), whose sum is σ = 121054560. Its totient is φ = 60390336.

The previous prime is 90688177. The next prime is 90688211. The reversal of 90688209 is 90288609.

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

It is not a de Polignac number, because 90688209 - 2⁵ = 90688177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90688219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13944 + ... + 19385.

It is an arithmetic number, because the mean of its divisors is an integer number (15131820).

Almost surely, 2^90688209 is an apocalyptic number.

It is an amenable number.

90688209 is a deficient number, since it is larger than the sum of its proper divisors (30366351).

90688209 is a wasteful number, since it uses less digits than its factorization.

90688209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34239.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 90688209 is about 9523.0357029678. The cubic root of 90688209 is about 449.2798506058.

The spelling of 90688209 in words is "ninety million, six hundred eighty-eight thousand, two hundred nine".