228745728 has 80 divisors (see below), whose sum is σ = 677144160. Its totient is φ = 76243968.

The previous prime is 228745717. The next prime is 228745739. The reversal of 228745728 is 827547822.

228745728 is a `hidden beast` number, since 2 + 2 + 8 + 74 + 572 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (228745717) and next prime (228745739).

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, 5551 + ... + 22097.

It is an arithmetic number, because the mean of its divisors is an integer number (8464302).

Almost surely, 2^228745728 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 228745728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338572080).

228745728 is an abundant number, since it is smaller than the sum of its proper divisors (448398432).

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

228745728 is an equidigital number, since it uses as much as digits as its factorization.

228745728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16574 (or 16552 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 228745728 is about 15124.3422336312. The cubic root of 228745728 is about 611.5767931501.

The spelling of 228745728 in words is "two hundred twenty-eight million, seven hundred forty-five thousand, seven hundred twenty-eight".