728776 has 8 divisors (see below), whose sum is σ = 1366470. Its totient is φ = 364384.

The previous prime is 728771. The next prime is 728809. The reversal of 728776 is 677827.

728776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 224676 = 710^2 + 474^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×728776² = 1062228916352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45541 + ... + 45556.

2⁷²⁸⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

728776 is a deficient number, since it is larger than the sum of its proper divisors (637694).

728776 is a wasteful number, since it uses less digits than its factorization.

728776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91103 (or 91099 counting only the distinct ones).

The product of its digits is 32928, while the sum is 37.

The square root of 728776 is about 853.6837822051. The cubic root of 728776 is about 89.9907809487.

The spelling of 728776 in words is "seven hundred twenty-eight thousand, seven hundred seventy-six".