90204081 has 16 divisors (see below), whose sum is σ = 132684480. Its totient is φ = 54053120.

The previous prime is 90204073. The next prime is 90204109. The reversal of 90204081 is 18040209.

It is not a de Polignac number, because 90204081 - 2³ = 90204073 is a prime.

It is a super-2 number, since 2×90204081² = 16273552458109122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90204041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12420 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (8292780).

Almost surely, 2^90204081 is an apocalyptic number.

It is an amenable number.

90204081 is a deficient number, since it is larger than the sum of its proper divisors (42480399).

90204081 is a wasteful number, since it uses less digits than its factorization.

90204081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30816.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 90204081 is about 9497.5829030338. The cubic root of 90204081 is about 448.4789484147.

The spelling of 90204081 in words is "ninety million, two hundred four thousand, eighty-one".