728663828 has 12 divisors (see below), whose sum is σ = 1330603680. Its totient is φ = 348491352.

The previous prime is 728663821. The next prime is 728663833. The reversal of 728663828 is 828366827.

728663828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×728663828² = 1061901948471227168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728663821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3960038 + ... + 3960221.

It is an arithmetic number, because the mean of its divisors is an integer number (110883640).

Almost surely, 2^728663828 is an apocalyptic number.

It is an amenable number.

728663828 is a deficient number, since it is larger than the sum of its proper divisors (601939852).

728663828 is a wasteful number, since it uses less digits than its factorization.

728663828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920286 (or 7920284 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 50.

The square root of 728663828 is about 26993.7738747290. The cubic root of 728663828 is about 899.8616363426.

The spelling of 728663828 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, eight hundred twenty-eight".