90981858 has 64 divisors (see below), whose sum is σ = 212129280. Its totient is φ = 25708800.

The previous prime is 90981817. The next prime is 90981883. The reversal of 90981858 is 85818909.

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

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 31 ways as a sum of consecutive naturals, for example, 146673 + ... + 147291.

It is an arithmetic number, because the mean of its divisors is an integer number (3314520).

Almost surely, 2^90981858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90981858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106064640).

90981858 is an abundant number, since it is smaller than the sum of its proper divisors (121147422).

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

90981858 is a wasteful number, since it uses less digits than its factorization.

90981858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

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

The square root of 90981858 is about 9538.4410675959. The cubic root of 90981858 is about 449.7642518253.

The spelling of 90981858 in words is "ninety million, nine hundred eighty-one thousand, eight hundred fifty-eight".