728805776 has 20 divisors (see below), whose sum is σ = 1495124172. Its totient is φ = 342967296.

The previous prime is 728805751. The next prime is 728805787. The reversal of 728805776 is 677508827.

It can be written as a sum of positive squares in 2 ways, for example, as 303456400 + 425349376 = 17420^2 + 20624^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1339445 + ... + 1339988.

Almost surely, 2^728805776 is an apocalyptic number.

It is an amenable number.

728805776 is an abundant number, since it is smaller than the sum of its proper divisors (766318396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728805776 is a wasteful number, since it uses less digits than its factorization.

728805776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679458 (or 2679452 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 50.

The square root of 728805776 is about 26996.4030196617. The cubic root of 728805776 is about 899.9200653287.

The spelling of 728805776 in words is "seven hundred twenty-eight million, eight hundred five thousand, seven hundred seventy-six".