726220 has 24 divisors (see below), whose sum is σ = 1664208. Its totient is φ = 264000.

The previous prime is 726191. The next prime is 726221. The reversal of 726220 is 22627.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726221) by changing a digit.

726220 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 7 ways as a sum of consecutive naturals, for example, 1431 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (69342).

2⁷²⁶²²⁰ is an apocalyptic number.

It is an amenable number.

726220 is an abundant number, since it is smaller than the sum of its proper divisors (937988).

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

726220 is a wasteful number, since it uses less digits than its factorization.

726220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321 (or 3319 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 726220 is about 852.1854258317. The cubic root of 726220 is about 89.8854509755.

Adding to 726220 its reverse (22627), we get a palindrome (748847).

It can be divided in two parts, 726 and 220, that added together give a triangular number (946 = T₄₃).

The spelling of 726220 in words is "seven hundred twenty-six thousand, two hundred twenty".