9987228 has 36 divisors (see below), whose sum is σ = 26732160. Its totient is φ = 3133056.

The previous prime is 9987209. The next prime is 9987247. The reversal of 9987228 is 8227899.

It is an interprime number because it is at equal distance from previous prime (9987209) and next prime (9987247).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7548 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^9987228 is an apocalyptic number.

It is an amenable number.

9987228 is an abundant number, since it is smaller than the sum of its proper divisors (16744932).

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

9987228 is a wasteful number, since it uses less digits than its factorization.

9987228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16346 (or 16341 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 9987228 is about 3160.2575844383. The cubic root of 9987228 is about 215.3517084604.

The spelling of 9987228 in words is "nine million, nine hundred eighty-seven thousand, two hundred twenty-eight".