90685217 has 8 divisors (see below), whose sum is σ = 104647296. Its totient is φ = 76974912.

The previous prime is 90685211. The next prime is 90685229. The reversal of 90685217 is 71258609.

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

It is not a de Polignac number, because 90685217 - 2²² = 86490913 is a prime.

It is a super-3 number, since 3×90685217³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90685211) 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, 62168 + ... + 63609.

It is an arithmetic number, because the mean of its divisors is an integer number (13080912).

Almost surely, 2^90685217 is an apocalyptic number.

It is an amenable number.

90685217 is a deficient number, since it is larger than the sum of its proper divisors (13962079).

90685217 is a wasteful number, since it uses less digits than its factorization.

90685217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125887.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 90685217 is about 9522.8786089081. The cubic root of 90685217 is about 449.2749096471.

The spelling of 90685217 in words is "ninety million, six hundred eighty-five thousand, two hundred seventeen".