90189858 has 32 divisors (see below), whose sum is σ = 197144640. Its totient is φ = 27279360.

The previous prime is 90189857. The next prime is 90189863. The reversal of 90189858 is 85898109.

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 (90189857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49866 + ... + 51642.

It is an arithmetic number, because the mean of its divisors is an integer number (6160770).

Almost surely, 2^90189858 is an apocalyptic number.

90189858 is an abundant number, since it is smaller than the sum of its proper divisors (106954782).

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

90189858 is a wasteful number, since it uses less digits than its factorization.

90189858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 90189858 is about 9496.8341040580. The cubic root of 90189858 is about 448.4553757511.

The spelling of 90189858 in words is "ninety million, one hundred eighty-nine thousand, eight hundred fifty-eight".