720722 has 8 divisors (see below), whose sum is σ = 1093500. Its totient is φ = 356224.

The previous prime is 720703. The next prime is 720743. The reversal of 720722 is 227027.

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 63001 = 811^2 + 251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 720694 and 720703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847 + ... + 2202.

2⁷²⁰⁷²² is an apocalyptic number.

720722 is a deficient number, since it is larger than the sum of its proper divisors (372778).

720722 is a wasteful number, since it uses less digits than its factorization.

720722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140.

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

The square root of 720722 is about 848.9534734012. The cubic root of 720722 is about 89.6580439433.

Adding to 720722 its reverse (227027), we get a palindrome (947749).

The spelling of 720722 in words is "seven hundred twenty thousand, seven hundred twenty-two", and thus it is an iban number.