726728 has 8 divisors (see below), whose sum is σ = 1362630. Its totient is φ = 363360.

The previous prime is 726707. The next prime is 726751. The reversal of 726728 is 827627.

It can be written as a sum of positive squares in only one way, i.e., 432964 + 293764 = 658^2 + 542^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 726694 and 726703.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45413 + ... + 45428.

2⁷²⁶⁷²⁸ is an apocalyptic number.

It is an amenable number.

726728 is a deficient number, since it is larger than the sum of its proper divisors (635902).

726728 is a wasteful number, since it uses less digits than its factorization.

726728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90847 (or 90843 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 726728 is about 852.4834309240. The cubic root of 726728 is about 89.9064047572.

It can be divided in two parts, 72 and 6728, that multiplied together give a square (484416 = 696²).

The spelling of 726728 in words is "seven hundred twenty-six thousand, seven hundred twenty-eight".