90536809 has 16 divisors (see below), whose sum is σ = 103420800. Its totient is φ = 78453760.

The previous prime is 90536777. The next prime is 90536813. The reversal of 90536809 is 90863509.

It is not a de Polignac number, because 90536809 - 2⁵ = 90536777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90536819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113199 + ... + 113995.

It is an arithmetic number, because the mean of its divisors is an integer number (6463800).

Almost surely, 2^90536809 is an apocalyptic number.

It is an amenable number.

90536809 is a deficient number, since it is larger than the sum of its proper divisors (12883991).

90536809 is a wasteful number, since it uses less digits than its factorization.

90536809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 90536809 is about 9515.0832366301. The cubic root of 90536809 is about 449.0296936561.

The spelling of 90536809 in words is "ninety million, five hundred thirty-six thousand, eight hundred nine".