32172228 has 168 divisors, whose sum is σ = 99156960. Its totient is φ = 9020160.

The previous prime is 32172227. The next prime is 32172233. The reversal of 32172228 is 82227123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (32172227) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 545263 + ... + 545321.

It is an arithmetic number, because the mean of its divisors is an integer number (590220).

Almost surely, 2^32172228 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 32172228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49578480).

32172228 is an abundant number, since it is smaller than the sum of its proper divisors (66984732).

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

32172228 is a wasteful number, since it uses less digits than its factorization.

32172228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 92 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 32172228 is about 5672.0567698146. The cubic root of 32172228 is about 318.0487643267.

It can be divided in two parts, 32172 and 228, that added together give a square (32400 = 180²).

The spelling of 32172228 in words is "thirty-two million, one hundred seventy-two thousand, two hundred twenty-eight".