728856028 has 24 divisors (see below), whose sum is σ = 1373425200. Its totient is φ = 337175808.

The previous prime is 728856019. The next prime is 728856061. The reversal of 728856028 is 820658827.

It is a happy number.

It is a super-2 number, since 2×728856028² = 1062462219103873568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86823 + ... + 94846.

It is an arithmetic number, because the mean of its divisors is an integer number (57226050).

Almost surely, 2^728856028 is an apocalyptic number.

It is an amenable number.

728856028 is a deficient number, since it is larger than the sum of its proper divisors (644569172).

728856028 is a wasteful number, since it uses less digits than its factorization.

728856028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181749 (or 181747 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 728856028 is about 26997.3337202028. Note that the first 3 decimals coincide. The cubic root of 728856028 is about 899.9407483626.

The spelling of 728856028 in words is "seven hundred twenty-eight million, eight hundred fifty-six thousand, twenty-eight".