28232172 has 48 divisors (see below), whose sum is σ = 77505120. Its totient is φ = 8856576.

The previous prime is 28232161. The next prime is 28232173. The reversal of 28232172 is 27123282.

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 (28232173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5853 + ... + 9524.

It is an arithmetic number, because the mean of its divisors is an integer number (1614690).

Almost surely, 2^28232172 is an apocalyptic number.

It is an amenable number.

28232172 is an abundant number, since it is smaller than the sum of its proper divisors (49272948).

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

28232172 is a wasteful number, since it uses less digits than its factorization.

28232172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15407 (or 15399 counting only the distinct ones).

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

The square root of 28232172 is about 5313.3955245210. The cubic root of 28232172 is about 304.4958867653.

The spelling of 28232172 in words is "twenty-eight million, two hundred thirty-two thousand, one hundred seventy-two".