228997728 has 72 divisors (see below), whose sum is σ = 685503000. Its totient is φ = 72313344.

The previous prime is 228997723. The next prime is 228997753. The reversal of 228997728 is 827799822.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228997723) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15453 + ... + 26396.

It is an arithmetic number, because the mean of its divisors is an integer number (9520875).

Almost surely, 2^228997728 is an apocalyptic number.

It is an amenable number.

228997728 is an abundant number, since it is smaller than the sum of its proper divisors (456505272).

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

228997728 is a wasteful number, since it uses less digits than its factorization.

228997728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41884 (or 41873 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 228997728 is about 15132.6708812423. The cubic root of 228997728 is about 611.8012939424.

The spelling of 228997728 in words is "two hundred twenty-eight million, nine hundred ninety-seven thousand, seven hundred twenty-eight".