90506205 has 24 divisors (see below), whose sum is σ = 161940480. Its totient is φ = 46712160.

The previous prime is 90506183. The next prime is 90506209. The reversal of 90506205 is 50260509.

It is not a de Polignac number, because 90506205 - 2⁷ = 90506077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90506209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31045 + ... + 33834.

It is an arithmetic number, because the mean of its divisors is an integer number (6747520).

Almost surely, 2^90506205 is an apocalyptic number.

It is an amenable number.

90506205 is a deficient number, since it is larger than the sum of its proper divisors (71434275).

90506205 is a wasteful number, since it uses less digits than its factorization.

90506205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64921 (or 64918 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 90506205 is about 9513.4749171898. The cubic root of 90506205 is about 448.9790930456.

The spelling of 90506205 in words is "ninety million, five hundred six thousand, two hundred five".