728665228 has 12 divisors (see below), whose sum is σ = 1275364552. Its totient is φ = 364275360.

The previous prime is 728665183. The next prime is 728665241. The reversal of 728665228 is 822566827.

728665228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 28648 + ... + 47728.

Almost surely, 2^728665228 is an apocalyptic number.

It is an amenable number.

728665228 is a deficient number, since it is larger than the sum of its proper divisors (546699324).

728665228 is a wasteful number, since it uses less digits than its factorization.

728665228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28632 (or 28630 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 728665228 is about 26993.7998066223. The cubic root of 728665228 is about 899.8622126511.

The spelling of 728665228 in words is "seven hundred twenty-eight million, six hundred sixty-five thousand, two hundred twenty-eight".