726820 has 12 divisors (see below), whose sum is σ = 1526364. Its totient is φ = 290720.

The previous prime is 726811. The next prime is 726839. The reversal of 726820 is 28627.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 306916 = 648^2 + 554^2 .

It is an unprimeable number.

726820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18151 + ... + 18190.

It is an arithmetic number, because the mean of its divisors is an integer number (127197).

2⁷²⁶⁸²⁰ is an apocalyptic number.

It is an amenable number.

726820 is an abundant number, since it is smaller than the sum of its proper divisors (799544).

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

726820 is a wasteful number, since it uses less digits than its factorization.

726820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36350 (or 36348 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 726820 is about 852.5373892094. The cubic root of 726820 is about 89.9101984922.

The spelling of 726820 in words is "seven hundred twenty-six thousand, eight hundred twenty".