228318728 has 16 divisors (see below), whose sum is σ = 467015760. Its totient is φ = 103781200.

The previous prime is 228318719. The next prime is 228318743. The reversal of 228318728 is 827813822.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297178 + ... + 1297353.

It is an arithmetic number, because the mean of its divisors is an integer number (29188485).

Almost surely, 2^228318728 is an apocalyptic number.

It is an amenable number.

228318728 is an abundant number, since it is smaller than the sum of its proper divisors (238697032).

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

228318728 is a wasteful number, since it uses less digits than its factorization.

228318728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594548 (or 2594544 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 228318728 is about 15110.2193233586. The cubic root of 228318728 is about 611.1960123389.

The spelling of 228318728 in words is "two hundred twenty-eight million, three hundred eighteen thousand, seven hundred twenty-eight".