990243220 has 12 divisors (see below), whose sum is σ = 2079510804. Its totient is φ = 396097280.

The previous prime is 990243209. The next prime is 990243223. The reversal of 990243220 is 22342099.

990243220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 593994384 + 396248836 = 24372^2 + 19906^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990243223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24756061 + ... + 24756100.

It is an arithmetic number, because the mean of its divisors is an integer number (173292567).

Almost surely, 2^990243220 is an apocalyptic number.

It is an amenable number.

990243220 is an abundant number, since it is smaller than the sum of its proper divisors (1089267584).

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

990243220 is a wasteful number, since it uses less digits than its factorization.

990243220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49512170 (or 49512168 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 990243220 is about 31468.1302272633. The cubic root of 990243220 is about 996.7371050963.

The spelling of 990243220 in words is "nine hundred ninety million, two hundred forty-three thousand, two hundred twenty".