90185805 has 48 divisors (see below), whose sum is σ = 163363200. Its totient is φ = 47729088.

The previous prime is 90185803. The next prime is 90185827. The reversal of 90185805 is 50858109.

It is not a de Polignac number, because 90185805 - 2¹ = 90185803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90185805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90185803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 241599 + ... + 241971.

It is an arithmetic number, because the mean of its divisors is an integer number (3403400).

Almost surely, 2^90185805 is an apocalyptic number.

It is an amenable number.

90185805 is a deficient number, since it is larger than the sum of its proper divisors (73177395).

90185805 is a wasteful number, since it uses less digits than its factorization.

90185805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 90185805 is about 9496.6207147595. The cubic root of 90185805 is about 448.4486580080.

The spelling of 90185805 in words is "ninety million, one hundred eighty-five thousand, eight hundred five".