999220224 has 176 divisors, whose sum is σ = 2800296000. Its totient is φ = 316440576.

The previous prime is 999220213. The next prime is 999220247. The reversal of 999220224 is 422022999.

It is a super-2 number, since 2×999220224² = 1996882112101220352, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 6706102 + ... + 6706250.

Almost surely, 2^999220224 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 999220224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1400148000).

999220224 is an abundant number, since it is smaller than the sum of its proper divisors (1801075776).

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

999220224 is a wasteful number, since it uses less digits than its factorization.

999220224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 999220224 is about 31610.4448560915. Note that the first 3 decimals coincide. The cubic root of 999220224 is about 999.7400070762.

The spelling of 999220224 in words is "nine hundred ninety-nine million, two hundred twenty thousand, two hundred twenty-four".