722320 has 20 divisors (see below), whose sum is σ = 1679580. Its totient is φ = 288896.

The previous prime is 722317. The next prime is 722321. The reversal of 722320 is 23227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 565504 + 156816 = 752^2 + 396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 722294 and 722303.

It is not an unprimeable number, because it can be changed into a prime (722321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4435 + ... + 4594.

It is an arithmetic number, because the mean of its divisors is an integer number (83979).

2⁷²²³²⁰ is an apocalyptic number.

It is an amenable number.

722320 is an abundant number, since it is smaller than the sum of its proper divisors (957260).

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

722320 is a wasteful number, since it uses less digits than its factorization.

722320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9042 (or 9036 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 722320 is about 849.8941110515. The cubic root of 722320 is about 89.7242589308.

Adding to 722320 its reverse (23227), we get a palindrome (745547).

The spelling of 722320 in words is "seven hundred twenty-two thousand, three hundred twenty", and thus it is an iban number.