90218738 has 8 divisors (see below), whose sum is σ = 135370332. Its totient is φ = 45095296.

The previous prime is 90218717. The next prime is 90218741. The reversal of 90218738 is 83781209.

It can be written as a sum of positive squares in 2 ways, for example, as 78198649 + 12020089 = 8843^2 + 3467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5306 + ... + 14442.

Almost surely, 2^90218738 is an apocalyptic number.

90218738 is a deficient number, since it is larger than the sum of its proper divisors (45151594).

90218738 is a wasteful number, since it uses less digits than its factorization.

90218738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14076.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 90218738 is about 9498.3544890681. The cubic root of 90218738 is about 448.5032377812.

The spelling of 90218738 in words is "ninety million, two hundred eighteen thousand, seven hundred thirty-eight".