28018224 has 100 divisors (see below), whose sum is σ = 87383296. Its totient is φ = 8615808.

The previous prime is 28018187. The next prime is 28018247. The reversal of 28018224 is 42281082.

It is a super-2 number, since 2×28018224² = 1570041752228352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 16017 + ... + 17679.

Almost surely, 2^28018224 is an apocalyptic number.

28018224 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 28018224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43691648).

28018224 is an abundant number, since it is smaller than the sum of its proper divisors (59365072).

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

28018224 is a wasteful number, since it uses less digits than its factorization.

28018224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28018224 is about 5293.2243481644. The cubic root of 28018224 is about 303.7247624208.

It can be divided in two parts, 2801 and 8224, that added together give a square (11025 = 105²).

The spelling of 28018224 in words is "twenty-eight million, eighteen thousand, two hundred twenty-four".