728639504 has 20 divisors (see below), whose sum is σ = 1413185964. Its totient is φ = 363946368.

The previous prime is 728639491. The next prime is 728639507. The reversal of 728639504 is 405936827.

It can be written as a sum of positive squares in 2 ways, for example, as 642521104 + 86118400 = 25348^2 + 9280^2 .

It is not an unprimeable number, because it can be changed into a prime (728639507) 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, 6887 + ... + 38790.

Almost surely, 2^728639504 is an apocalyptic number.

It is an amenable number.

728639504 is a deficient number, since it is larger than the sum of its proper divisors (684546460).

728639504 is a wasteful number, since it uses less digits than its factorization.

728639504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46682 (or 46676 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 728639504 is about 26993.3233226292. The cubic root of 728639504 is about 899.8516232761.

The spelling of 728639504 in words is "seven hundred twenty-eight million, six hundred thirty-nine thousand, five hundred four".