228728291328 has 90 divisors (see below), whose sum is σ = 660750880244. Its totient is φ = 76242714624.

The previous prime is 228728291269. The next prime is 228728291347. The reversal of 228728291328 is 823192827822.

228728291328 is a `hidden beast` number, since 2 + 2 + 8 + 7 + 28 + 291 + 328 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628126 + ... + 923037.

Almost surely, 2^228728291328 is an apocalyptic number.

It is an amenable number.

228728291328 is an abundant number, since it is smaller than the sum of its proper divisors (432022588916).

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

228728291328 is an equidigital number, since it uses as much as digits as its factorization.

228728291328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551197 (or 1551168 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 228728291328 in words is "two hundred twenty-eight billion, seven hundred twenty-eight million, two hundred ninety-one thousand, three hundred twenty-eight".