720345785 has 16 divisors (see below), whose sum is σ = 888696576. Its totient is φ = 560121408.

The previous prime is 720345719. The next prime is 720345799. The reversal of 720345785 is 587543027.

It is a cyclic number.

It is not a de Polignac number, because 720345785 - 2¹² = 720341689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296084 + ... + 298506.

It is an arithmetic number, because the mean of its divisors is an integer number (55543536).

Almost surely, 2^720345785 is an apocalyptic number.

It is an amenable number.

720345785 is a deficient number, since it is larger than the sum of its proper divisors (168350791).

720345785 is a wasteful number, since it uses less digits than its factorization.

720345785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072.

The product of its (nonzero) digits is 235200, while the sum is 41.

The square root of 720345785 is about 26839.2582796172. The cubic root of 720345785 is about 896.4244080649.

The spelling of 720345785 in words is "seven hundred twenty million, three hundred forty-five thousand, seven hundred eighty-five".