720563 has 4 divisors (see below), whose sum is σ = 745440. Its totient is φ = 695688.

The previous prime is 720547. The next prime is 720569. The reversal of 720563 is 365027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720563 - 2⁴ = 720547 is a prime.

It is a super-2 number, since 2×720563² = 1038422073938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720569) 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, 12395 + ... + 12452.

It is an arithmetic number, because the mean of its divisors is an integer number (186360).

2⁷²⁰⁵⁶³ is an apocalyptic number.

720563 is a deficient number, since it is larger than the sum of its proper divisors (24877).

720563 is a wasteful number, since it uses less digits than its factorization.

720563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24876.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 720563 is about 848.8598235280. The cubic root of 720563 is about 89.6514502416.

The spelling of 720563 in words is "seven hundred twenty thousand, five hundred sixty-three".