90218290 has 16 divisors (see below), whose sum is σ = 162516312. Its totient is φ = 36059904.

The previous prime is 90218273. The next prime is 90218309. The reversal of 90218290 is 9281209.

It can be written as a sum of positive squares in 4 ways, for example, as 88153321 + 2064969 = 9389^2 + 1437^2 .

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, 15232 + ... + 20308.

Almost surely, 2^90218290 is an apocalyptic number.

90218290 is a deficient number, since it is larger than the sum of its proper divisors (72298022).

90218290 is a wasteful number, since it uses less digits than its factorization.

90218290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 90218290 is about 9498.3309060066. The cubic root of 90218290 is about 448.5024954011.

Adding to 90218290 its reverse (9281209), we get a palindrome (99499499).

The spelling of 90218290 in words is "ninety million, two hundred eighteen thousand, two hundred ninety".