728903312 has 10 divisors (see below), whose sum is σ = 1412250198. Its totient is φ = 364451648.

The previous prime is 728903311. The next prime is 728903317. The reversal of 728903312 is 213309827.

It can be written as a sum of positive squares in only one way, i.e., 706283776 + 22619536 = 26576^2 + 4756^2 .

It is a super-5 number, since 5×728903312⁵ (a number of 46 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (728903311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22778213 + ... + 22778244.

Almost surely, 2^728903312 is an apocalyptic number.

It is an amenable number.

728903312 is a deficient number, since it is larger than the sum of its proper divisors (683346886).

728903312 is a wasteful number, since it uses less digits than its factorization.

728903312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45556465 (or 45556459 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 728903312 is about 26998.2094221080. The cubic root of 728903312 is about 899.9602089404.

The spelling of 728903312 in words is "seven hundred twenty-eight million, nine hundred three thousand, three hundred twelve".