90823220 has 18 divisors (see below), whose sum is σ = 190818306. Its totient is φ = 36312240.

The previous prime is 90823207. The next prime is 90823247. The reversal of 90823220 is 2232809.

It can be written as a sum of positive squares in only one way, i.e., 72658576 + 18164644 = 8524^2 + 4262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90823220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41555 + ... + 43685.

It is an arithmetic number, because the mean of its divisors is an integer number (10601017).

Almost surely, 2^90823220 is an apocalyptic number.

It is an amenable number.

90823220 is an abundant number, since it is smaller than the sum of its proper divisors (99995086).

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

90823220 is an equidigital number, since it uses as much as digits as its factorization.

90823220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 90823220 is about 9530.1217201041. The cubic root of 90823220 is about 449.5026934145.

The spelling of 90823220 in words is "ninety million, eight hundred twenty-three thousand, two hundred twenty".