228506728 has 16 divisors (see below), whose sum is σ = 432382500. Its totient is φ = 113204736.

The previous prime is 228506713. The next prime is 228506737. The reversal of 228506728 is 827605822.

It can be written as a sum of positive squares in 2 ways, for example, as 215561124 + 12945604 = 14682^2 + 3598^2 .

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, 130153 + ... + 131896.

Almost surely, 2^228506728 is an apocalyptic number.

It is an amenable number.

228506728 is a deficient number, since it is larger than the sum of its proper divisors (203875772).

228506728 is a wasteful number, since it uses less digits than its factorization.

228506728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262164 (or 262160 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 228506728 is about 15116.4389986531. The cubic root of 228506728 is about 611.3637213537.

The spelling of 228506728 in words is "two hundred twenty-eight million, five hundred six thousand, seven hundred twenty-eight".