28224284 has 48 divisors (see below), whose sum is σ = 57788640. Its totient is φ = 11919360.

The previous prime is 28224271. The next prime is 28224293. The reversal of 28224284 is 48242282.

It is a happy number.

It is a super-2 number, since 2×28224284² = 1593220414625312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28224284.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72362 + ... + 72750.

It is an arithmetic number, because the mean of its divisors is an integer number (1203930).

Almost surely, 2^28224284 is an apocalyptic number.

It is an amenable number.

28224284 is an abundant number, since it is smaller than the sum of its proper divisors (29564356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28224284 is a wasteful number, since it uses less digits than its factorization.

28224284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 516 counting only the distinct ones).

The product of its digits is 16384, while the sum is 32.

The square root of 28224284 is about 5312.6531977911. The cubic root of 28224284 is about 304.4675256544.

The spelling of 28224284 in words is "twenty-eight million, two hundred twenty-four thousand, two hundred eighty-four".