90208017 has 6 divisors (see below), whose sum is σ = 130300482. Its totient is φ = 60138672.

The previous prime is 90208003. The next prime is 90208021. The reversal of 90208017 is 71080209.

It can be written as a sum of positive squares in only one way, i.e., 86881041 + 3326976 = 9321^2 + 1824^2 .

It is not a de Polignac number, because 90208017 - 2¹⁸ = 89945873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90208117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5011548 + ... + 5011565.

It is an arithmetic number, because the mean of its divisors is an integer number (21716747).

Almost surely, 2^90208017 is an apocalyptic number.

It is an amenable number.

90208017 is a deficient number, since it is larger than the sum of its proper divisors (40092465).

90208017 is a wasteful number, since it uses less digits than its factorization.

90208017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10023119 (or 10023116 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 90208017 is about 9497.7901113891. The cubic root of 90208017 is about 448.4854713548.

The spelling of 90208017 in words is "ninety million, two hundred eight thousand, seventeen".