28145224 has 16 divisors (see below), whose sum is σ = 52830000. Its totient is φ = 14057232.

The previous prime is 28145209. The next prime is 28145267. The reversal of 28145224 is 42254182.

It is a junction number, because it is equal to n+sod(n) for n = 28145192 and 28145201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10819 + ... + 13165.

It is an arithmetic number, because the mean of its divisors is an integer number (3301875).

Almost surely, 2^28145224 is an apocalyptic number.

It is an amenable number.

28145224 is a deficient number, since it is larger than the sum of its proper divisors (24684776).

28145224 is a wasteful number, since it uses less digits than its factorization.

28145224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852 (or 3848 counting only the distinct ones).

The product of its digits is 5120, while the sum is 28.

The square root of 28145224 is about 5305.2072532560. The cubic root of 28145224 is about 304.1829750268.

The spelling of 28145224 in words is "twenty-eight million, one hundred forty-five thousand, two hundred twenty-four".