228555728 has 40 divisors (see below), whose sum is σ = 462727080. Its totient is φ = 109222400.

The previous prime is 228555673. The next prime is 228555739. The reversal of 228555728 is 827555822.

It can be written as a sum of positive squares in 4 ways, for example, as 69089344 + 159466384 = 8312^2 + 12628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44426 + ... + 49302.

It is an arithmetic number, because the mean of its divisors is an integer number (11568177).

Almost surely, 2^228555728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228555728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231363540).

228555728 is an abundant number, since it is smaller than the sum of its proper divisors (234171352).

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

228555728 is a wasteful number, since it uses less digits than its factorization.

228555728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015 (or 5009 counting only the distinct ones).

The product of its digits is 448000, while the sum is 44.

The square root of 228555728 is about 15118.0596638590. The cubic root of 228555728 is about 611.4074176328.

The spelling of 228555728 in words is "two hundred twenty-eight million, five hundred fifty-five thousand, seven hundred twenty-eight".