28306224 has 120 divisors (see below), whose sum is σ = 86815872. Its totient is φ = 8570880.

The previous prime is 28306217. The next prime is 28306247. The reversal of 28306224 is 42260382.

28306224 is a `hidden beast` number, since 2 + 8 + 30 + 622 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75702 + ... + 76074.

Almost surely, 2^28306224 is an apocalyptic number.

28306224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28306224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43407936).

28306224 is an abundant number, since it is smaller than the sum of its proper divisors (58509648).

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

28306224 is a wasteful number, since it uses less digits than its factorization.

28306224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28306224 is about 5320.3593863573. The cubic root of 28306224 is about 304.7618816902.

The spelling of 28306224 in words is "twenty-eight million, three hundred six thousand, two hundred twenty-four".