28745224 has 16 divisors (see below), whose sum is σ = 54547920. Its totient is φ = 14199120.

The previous prime is 28745221. The next prime is 28745231. The reversal of 28745224 is 42254782.

It is a self number, because there is not a number n which added to its sum of digits gives 28745224.

It is not an unprimeable number, because it can be changed into a prime (28745221) 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, 20982 + ... + 22309.

It is an arithmetic number, because the mean of its divisors is an integer number (3409245).

Almost surely, 2^28745224 is an apocalyptic number.

It is an amenable number.

28745224 is a deficient number, since it is larger than the sum of its proper divisors (25802696).

28745224 is a wasteful number, since it uses less digits than its factorization.

28745224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43380 (or 43376 counting only the distinct ones).

The product of its digits is 35840, while the sum is 34.

The square root of 28745224 is about 5361.4572645877. The cubic root of 28745224 is about 306.3293192295.

The spelling of 28745224 in words is "twenty-eight million, seven hundred forty-five thousand, two hundred twenty-four".