90564558 has 16 divisors (see below), whose sum is σ = 207004800. Its totient is φ = 25875576.

The previous prime is 90564557. The next prime is 90564569. The reversal of 90564558 is 85546509.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 2156299 = 90564558 / (9 + 0 + 5 + 6 + 4 + 5 + 5 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90564553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078108 + ... + 1078191.

It is an arithmetic number, because the mean of its divisors is an integer number (12937800).

Almost surely, 2^90564558 is an apocalyptic number.

90564558 is an abundant number, since it is smaller than the sum of its proper divisors (116440242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90564558 is a wasteful number, since it uses less digits than its factorization.

90564558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156311.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 90564558 is about 9516.5412834706. The cubic root of 90564558 is about 449.0755639577.

The spelling of 90564558 in words is "ninety million, five hundred sixty-four thousand, five hundred fifty-eight".