28828224 has 140 divisors (see below), whose sum is σ = 87776304. Its totient is φ = 9351936.

The previous prime is 28828213. The next prime is 28828231. The reversal of 28828224 is 42282882.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 347287 + ... + 347369.

Almost surely, 2^28828224 is an apocalyptic number.

28828224 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 28828224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43888152).

28828224 is an abundant number, since it is smaller than the sum of its proper divisors (58948080).

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

28828224 is an equidigital number, since it uses as much as digits as its factorization.

28828224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 155 counting only the distinct ones).

The product of its digits is 32768, while the sum is 36.

The square root of 28828224 is about 5369.1921180006. The cubic root of 28828224 is about 306.6238713649.

The spelling of 28828224 in words is "twenty-eight million, eight hundred twenty-eight thousand, two hundred twenty-four".