728317628 has 6 divisors (see below), whose sum is σ = 1274555856. Its totient is φ = 364158812.

The previous prime is 728317607. The next prime is 728317637. The reversal of 728317628 is 826713827.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91039700 + ... + 91039707.

It is an arithmetic number, because the mean of its divisors is an integer number (212425976).

Almost surely, 2^728317628 is an apocalyptic number.

It is an amenable number.

728317628 is a deficient number, since it is larger than the sum of its proper divisors (546238228).

728317628 is a wasteful number, since it uses less digits than its factorization.

728317628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182079411 (or 182079409 counting only the distinct ones).

The product of its digits is 225792, while the sum is 44.

The square root of 728317628 is about 26987.3605230300. The cubic root of 728317628 is about 899.7191008150.

The spelling of 728317628 in words is "seven hundred twenty-eight million, three hundred seventeen thousand, six hundred twenty-eight".