720645244 has 48 divisors (see below), whose sum is σ = 1434746880. Its totient is φ = 313709760.

The previous prime is 720645241. The next prime is 720645257. The reversal of 720645244 is 442546027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720645241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159829 + ... + 164275.

It is an arithmetic number, because the mean of its divisors is an integer number (29890560).

Almost surely, 2^720645244 is an apocalyptic number.

It is an amenable number.

720645244 is a deficient number, since it is larger than the sum of its proper divisors (714101636).

720645244 is a wasteful number, since it uses less digits than its factorization.

720645244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618 (or 4616 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 720645244 is about 26844.8364494925. The cubic root of 720645244 is about 896.5486100673.

The spelling of 720645244 in words is "seven hundred twenty million, six hundred forty-five thousand, two hundred forty-four".