28484172 has 18 divisors (see below), whose sum is σ = 72001748. Its totient is φ = 9494712.

The previous prime is 28484171. The next prime is 28484213. The reversal of 28484172 is 27148482.

28484172 is a `hidden beast` number, since 2 + 8 + 484 + 172 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×28484172² = 1622696109051168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 791227 = 28484172 / (2 + 8 + 4 + 8 + 4 + 1 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (28484171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395578 + ... + 395649.

Almost surely, 2^28484172 is an apocalyptic number.

It is an amenable number.

28484172 is an abundant number, since it is smaller than the sum of its proper divisors (43517576).

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

28484172 is a wasteful number, since it uses less digits than its factorization.

28484172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791237 (or 791232 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28484172 is about 5337.0564921125. The cubic root of 28484172 is about 305.3991799196.

The spelling of 28484172 in words is "twenty-eight million, four hundred eighty-four thousand, one hundred seventy-two".