28684172 has 12 divisors (see below), whose sum is σ = 54760776. Its totient is φ = 13038240.

The previous prime is 28684169. The next prime is 28684177. The reversal of 28684172 is 27148682.

It is not an unprimeable number, because it can be changed into a prime (28684177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325913 + ... + 326000.

It is an arithmetic number, because the mean of its divisors is an integer number (4563398).

Almost surely, 2^28684172 is an apocalyptic number.

28684172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28684172 is a deficient number, since it is larger than the sum of its proper divisors (26076604).

28684172 is a wasteful number, since it uses less digits than its factorization.

28684172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651928 (or 651926 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 28684172 is about 5355.7606369217. The cubic root of 28684172 is about 306.1122944970.

The spelling of 28684172 in words is "twenty-eight million, six hundred eighty-four thousand, one hundred seventy-two".