722720 has 24 divisors (see below), whose sum is σ = 1707804. Its totient is φ = 289024.

The previous prime is 722713. The next prime is 722723. The reversal of 722720 is 27227.

It can be written as a sum of positive squares in 2 ways, for example, as 595984 + 126736 = 772^2 + 356^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 722692 and 722701.

It is not an unprimeable number, because it can be changed into a prime (722723) by changing a digit.

722720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 2099 + ... + 2418.

2⁷²²⁷²⁰ is an apocalyptic number.

It is an amenable number.

722720 is an abundant number, since it is smaller than the sum of its proper divisors (985084).

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

722720 is a wasteful number, since it uses less digits than its factorization.

722720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532 (or 4524 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 722720 is about 850.1294019148. The cubic root of 722720 is about 89.7408181108.

Adding to 722720 its reverse (27227), we get a palindrome (749947).

The spelling of 722720 in words is "seven hundred twenty-two thousand, seven hundred twenty", and thus it is an iban number.