28920224 has 12 divisors (see below), whose sum is σ = 56936754. Its totient is φ = 14460096.

The previous prime is 28920173. The next prime is 28920233. The reversal of 28920224 is 42202982.

It can be written as a sum of positive squares in only one way, i.e., 28430224 + 490000 = 5332^2 + 700^2 .

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, 451847 + ... + 451910.

Almost surely, 2^28920224 is an apocalyptic number.

It is an amenable number.

28920224 is a deficient number, since it is larger than the sum of its proper divisors (28016530).

28920224 is an equidigital number, since it uses as much as digits as its factorization.

28920224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903767 (or 903759 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28920224 is about 5377.7526904833. The cubic root of 28920224 is about 306.9497029860.

The spelling of 28920224 in words is "twenty-eight million, nine hundred twenty thousand, two hundred twenty-four".