720013445 has 16 divisors (see below), whose sum is σ = 888364800. Its totient is φ = 559944384.

The previous prime is 720013397. The next prime is 720013447. The reversal of 720013445 is 544310027.

It is not a de Polignac number, because 720013445 - 2¹⁰ = 720012421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720013447) 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 15 ways as a sum of consecutive naturals, for example, 24734 + ... + 45296.

It is an arithmetic number, because the mean of its divisors is an integer number (55522800).

Almost surely, 2^720013445 is an apocalyptic number.

It is an amenable number.

720013445 is a deficient number, since it is larger than the sum of its proper divisors (168351355).

720013445 is a wasteful number, since it uses less digits than its factorization.

720013445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20764.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 720013445 is about 26833.0662616109. The cubic root of 720013445 is about 896.2865282107.

The spelling of 720013445 in words is "seven hundred twenty million, thirteen thousand, four hundred forty-five".