720449 has 4 divisors (see below), whose sum is σ = 732720. Its totient is φ = 708180.

The previous prime is 720439. The next prime is 720481. The reversal of 720449 is 944027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 720449 - 2⁸ = 720193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6047 + ... + 6164.

It is an arithmetic number, because the mean of its divisors is an integer number (183180).

2⁷²⁰⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

720449 is a deficient number, since it is larger than the sum of its proper divisors (12271).

720449 is a wasteful number, since it uses less digits than its factorization.

720449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 720449 is about 848.7926719759. The cubic root of 720449 is about 89.6467220849.

The spelling of 720449 in words is "seven hundred twenty thousand, four hundred forty-nine".