720163 has 4 divisors (see below), whose sum is σ = 726880. Its totient is φ = 713448.

The previous prime is 720151. The next prime is 720173. The reversal of 720163 is 361027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 361027 = 149 ⋅2423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720163.

It is not an unprimeable number, because it can be changed into a prime (720133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3195 + ... + 3412.

It is an arithmetic number, because the mean of its divisors is an integer number (181720).

2⁷²⁰¹⁶³ is an apocalyptic number.

720163 is a deficient number, since it is larger than the sum of its proper divisors (6717).

720163 is a wasteful number, since it uses less digits than its factorization.

720163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 720163 is about 848.6241806595. The cubic root of 720163 is about 89.6348580224.

It can be divided in two parts, 7 and 20163, that multiplied together give a palindrome (141141).

The spelling of 720163 in words is "seven hundred twenty thousand, one hundred sixty-three".