28252224 has 336 divisors, whose sum is σ = 110947200. Its totient is φ = 6773760.

The previous prime is 28252219. The next prime is 28252243. The reversal of 28252224 is 42225282.

It is a tau number, because it is divible by the number of its divisors (336).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2173242 + ... + 2173254.

It is an arithmetic number, because the mean of its divisors is an integer number (330200).

Almost surely, 2^28252224 is an apocalyptic number.

28252224 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 28252224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55473600).

28252224 is an abundant number, since it is smaller than the sum of its proper divisors (82694976).

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

28252224 is a wasteful number, since it uses less digits than its factorization.

28252224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 36 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 28252224 is about 5315.2821185709. The cubic root of 28252224 is about 304.5679594648.

It can be divided in two parts, 28 and 252224, that added together give a palindrome (252252).

The spelling of 28252224 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred twenty-four".