720320065 has 16 divisors (see below), whose sum is σ = 876572928. Its totient is φ = 568158976.

The previous prime is 720320053. The next prime is 720320071. The reversal of 720320065 is 560023027.

It is a cyclic number.

It is not a de Polignac number, because 720320065 - 2²¹ = 718222913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244632 + ... + 247558.

It is an arithmetic number, because the mean of its divisors is an integer number (54785808).

Almost surely, 2^720320065 is an apocalyptic number.

It is an amenable number.

720320065 is a deficient number, since it is larger than the sum of its proper divisors (156252863).

720320065 is a wasteful number, since it uses less digits than its factorization.

720320065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 720320065 is about 26838.7791264804. The cubic root of 720320065 is about 896.4137389711.

The spelling of 720320065 in words is "seven hundred twenty million, three hundred twenty thousand, sixty-five".