16728224 has 12 divisors (see below), whose sum is σ = 32933754. Its totient is φ = 8364096.

The previous prime is 16728209. The next prime is 16728241. The reversal of 16728224 is 42282761.

It can be written as a sum of positive squares in only one way, i.e., 9610000 + 7118224 = 3100^2 + 2668^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 522757 = 16728224 / (1 + 6 + 7 + 2 + 8 + 2 + 2 + 4).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 261347 + ... + 261410.

Almost surely, 2^16728224 is an apocalyptic number.

It is an amenable number.

16728224 is a deficient number, since it is larger than the sum of its proper divisors (16205530).

16728224 is an equidigital number, since it uses as much as digits as its factorization.

16728224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522767 (or 522759 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 16728224 is about 4090.0151588961. The cubic root of 16728224 is about 255.7505708541.

The spelling of 16728224 in words is "sixteen million, seven hundred twenty-eight thousand, two hundred twenty-four".