9901228 has 12 divisors (see below), whose sum is σ = 17547040. Its totient is φ = 4887792.

The previous prime is 9901219. The next prime is 9901231. The reversal of 9901228 is 8221099.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9901228.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15351 + ... + 15982.

Almost surely, 2^9901228 is an apocalyptic number.

It is an amenable number.

9901228 is a deficient number, since it is larger than the sum of its proper divisors (7645812).

9901228 is a wasteful number, since it uses less digits than its factorization.

9901228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31416 (or 31414 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9901228 is about 3146.6216804694. The cubic root of 9901228 is about 214.7317946406.

The spelling of 9901228 in words is "nine million, nine hundred one thousand, two hundred twenty-eight".