90585890 has 16 divisors (see below), whose sum is σ = 164670840. Its totient is φ = 35875200.

The previous prime is 90585871. The next prime is 90585899. The reversal of 90585890 is 9858509.

It can be written as a sum of positive squares in 4 ways, for example, as 89851441 + 734449 = 9479^2 + 857^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (90585899) 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 7 ways as a sum of consecutive naturals, for example, 43835 + ... + 45854.

Almost surely, 2^90585890 is an apocalyptic number.

90585890 is a deficient number, since it is larger than the sum of its proper divisors (74084950).

90585890 is a wasteful number, since it uses less digits than its factorization.

90585890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89797.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 90585890 is about 9517.6620028240. The cubic root of 90585890 is about 449.1108203100.

The spelling of 90585890 in words is "ninety million, five hundred eighty-five thousand, eight hundred ninety".