90055220 has 24 divisors (see below), whose sum is σ = 189316008. Its totient is φ = 35984000.

The previous prime is 90055219. The next prime is 90055241. The reversal of 90055220 is 2255009.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4048144 + 86007076 = 2012^2 + 9274^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24290 + ... + 27750.

It is an arithmetic number, because the mean of its divisors is an integer number (7888167).

Almost surely, 2^90055220 is an apocalyptic number.

It is an amenable number.

90055220 is an abundant number, since it is smaller than the sum of its proper divisors (99260788).

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

90055220 is a wasteful number, since it uses less digits than its factorization.

90055220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 90055220 is about 9489.7428837667. The cubic root of 90055220 is about 448.2321089433.

The spelling of 90055220 in words is "ninety million, fifty-five thousand, two hundred twenty".