8172228 has 12 divisors (see below), whose sum is σ = 19068560. Its totient is φ = 2724072.

The previous prime is 8172211. The next prime is 8172233. The reversal of 8172228 is 8222718.

It is a happy number.

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

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8172195 and 8172204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340498 + ... + 340521.

Almost surely, 2^8172228 is an apocalyptic number.

It is an amenable number.

8172228 is an abundant number, since it is smaller than the sum of its proper divisors (10896332).

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

8172228 is a wasteful number, since it uses less digits than its factorization.

8172228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681026 (or 681024 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 8172228 is about 2858.7108982896. The cubic root of 8172228 is about 201.4250553038.

The spelling of 8172228 in words is "eight million, one hundred seventy-two thousand, two hundred twenty-eight".