28249224 has 32 divisors (see below), whose sum is σ = 70809120. Its totient is φ = 9391616.

The previous prime is 28249187. The next prime is 28249229. The reversal of 28249224 is 42294282.

It is a happy number.

It is a Cunningham number, because it is equal to 5315²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28249229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9304 + ... + 11960.

It is an arithmetic number, because the mean of its divisors is an integer number (2212785).

Almost surely, 2^28249224 is an apocalyptic number.

28249224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28249224 is an abundant number, since it is smaller than the sum of its proper divisors (42559896).

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

28249224 is a wasteful number, since it uses less digits than its factorization.

28249224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 3105 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 28249224 is about 5314.9999059266. Note that the first 4 decimals coincide. The cubic root of 28249224 is about 304.5571787652.

The spelling of 28249224 in words is "twenty-eight million, two hundred forty-nine thousand, two hundred twenty-four".