28001224 has 16 divisors (see below), whose sum is σ = 52819200. Its totient is φ = 13916112.

The previous prime is 28001209. The next prime is 28001249. The reversal of 28001224 is 42210082.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9144 + ... + 11815.

It is an arithmetic number, because the mean of its divisors is an integer number (3301200).

Almost surely, 2^28001224 is an apocalyptic number.

It is an amenable number.

28001224 is a deficient number, since it is larger than the sum of its proper divisors (24817976).

28001224 is a wasteful number, since it uses less digits than its factorization.

28001224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21132 (or 21128 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 28001224 is about 5291.6182779940. The cubic root of 28001224 is about 303.6633218670.

The spelling of 28001224 in words is "twenty-eight million, one thousand, two hundred twenty-four".