90728558 has 16 divisors (see below), whose sum is σ = 145722240. Its totient is φ = 42214656.

The previous prime is 90728513. The next prime is 90728563. The reversal of 90728558 is 85582709.

It is a congruent number.

It is an unprimeable number.

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, 11966 + ... + 18017.

It is an arithmetic number, because the mean of its divisors is an integer number (9107640).

Almost surely, 2^90728558 is an apocalyptic number.

90728558 is a deficient number, since it is larger than the sum of its proper divisors (54993682).

90728558 is a wasteful number, since it uses less digits than its factorization.

90728558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30091.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 90728558 is about 9525.1539620103. The cubic root of 90728558 is about 449.3464719268.

The spelling of 90728558 in words is "ninety million, seven hundred twenty-eight thousand, five hundred fifty-eight".