720329 has 4 divisors (see below), whose sum is σ = 737940. Its totient is φ = 702720.

The previous prime is 720319. The next prime is 720359. The reversal of 720329 is 923027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923027 = 7 ⋅131861.

It can be written as a sum of positive squares in 2 ways, for example, as 23104 + 697225 = 152^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720319) by changing a digit.

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, 8744 + ... + 8825.

It is an arithmetic number, because the mean of its divisors is an integer number (184485).

2⁷²⁰³²⁹ is an apocalyptic number.

It is an amenable number.

720329 is a deficient number, since it is larger than the sum of its proper divisors (17611).

720329 is a wasteful number, since it uses less digits than its factorization.

720329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17610.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 720329 is about 848.7219803917. The cubic root of 720329 is about 89.6417445390.

The spelling of 720329 in words is "seven hundred twenty thousand, three hundred twenty-nine".