90581090 has 16 divisors (see below), whose sum is σ = 165343680. Its totient is φ = 35721840.

The previous prime is 90581063. The next prime is 90581093. The reversal of 90581090 is 9018509.

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 (90581093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63080 + ... + 64499.

It is an arithmetic number, because the mean of its divisors is an integer number (10333980).

Almost surely, 2^90581090 is an apocalyptic number.

90581090 is a deficient number, since it is larger than the sum of its proper divisors (74762590).

90581090 is a wasteful number, since it uses less digits than its factorization.

90581090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127657.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 90581090 is about 9517.4098367150. The cubic root of 90581090 is about 449.1028876175.

Adding to 90581090 its reverse (9018509), we get a palindrome (99599599).

The spelling of 90581090 in words is "ninety million, five hundred eighty-one thousand, ninety".