9999228 has 12 divisors (see below), whose sum is σ = 23331560. Its totient is φ = 3333072.

The previous prime is 9999221. The next prime is 9999233. The reversal of 9999228 is 8229999.

9999228 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999221) 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, 416623 + ... + 416646.

Almost surely, 2^9999228 is an apocalyptic number.

It is an amenable number.

9999228 is an abundant number, since it is smaller than the sum of its proper divisors (13332332).

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

9999228 is a wasteful number, since it uses less digits than its factorization.

9999228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833276 (or 833274 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 9999228 is about 3162.1555938948. The cubic root of 9999228 is about 215.4379247819.

The spelling of 9999228 in words is "nine million, nine hundred ninety-nine thousand, two hundred twenty-eight".