90715209 has 24 divisors (see below), whose sum is σ = 132826176. Its totient is φ = 54734400.

The previous prime is 90715201. The next prime is 90715241. The reversal of 90715209 is 90251709.

It is not a de Polignac number, because 90715209 - 2³ = 90715201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90715209.

It is not an unprimeable number, because it can be changed into a prime (90715201) 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 23 ways as a sum of consecutive naturals, for example, 501099 + ... + 501279.

It is an arithmetic number, because the mean of its divisors is an integer number (5534424).

Almost surely, 2^90715209 is an apocalyptic number.

It is an amenable number.

90715209 is a deficient number, since it is larger than the sum of its proper divisors (42110967).

90715209 is a wasteful number, since it uses less digits than its factorization.

90715209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 90715209 is about 9524.4532126522. The cubic root of 90715209 is about 449.3244332201.

The spelling of 90715209 in words is "ninety million, seven hundred fifteen thousand, two hundred nine".