990223488 has 128 divisors (see below), whose sum is σ = 2940537600. Its totient is φ = 328043520.

The previous prime is 990223477. The next prime is 990223499. The reversal of 990223488 is 884322099.

It is an interprime number because it is at equal distance from previous prime (990223477) and next prime (990223499).

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×990223488² = 1961085112373772288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624745 + ... + 626327.

It is an arithmetic number, because the mean of its divisors is an integer number (22972950).

Almost surely, 2^990223488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990223488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1470268800).

990223488 is an abundant number, since it is smaller than the sum of its proper divisors (1950314112).

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

990223488 is a wasteful number, since it uses less digits than its factorization.

990223488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 990223488 is about 31467.8167021482. The cubic root of 990223488 is about 996.7304845857.

The spelling of 990223488 in words is "nine hundred ninety million, two hundred twenty-three thousand, four hundred eighty-eight".