228843720 has 144 divisors (see below), whose sum is σ = 865236060. Its totient is φ = 52303104.

The previous prime is 228843707. The next prime is 228843731. The reversal of 228843720 is 27348822.

228843720 is a `hidden beast` number, since 2 + 288 + 4 + 372 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188622756 + 40220964 = 13734^2 + 6342^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11154 + ... + 24126.

Almost surely, 2^228843720 is an apocalyptic number.

228843720 is a gapful number since it is divisible by the number (20) 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 228843720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432618030).

228843720 is an abundant number, since it is smaller than the sum of its proper divisors (636392340).

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

228843720 is a wasteful number, since it uses less digits than its factorization.

228843720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13004 (or 12990 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 228843720 is about 15127.5814326018. The cubic root of 228843720 is about 611.6641114692.

The spelling of 228843720 in words is "two hundred twenty-eight million, eight hundred forty-three thousand, seven hundred twenty".