720497765 has 32 divisors (see below), whose sum is σ = 984614400. Its totient is φ = 501742080.

The previous prime is 720497761. The next prime is 720497783. The reversal of 720497765 is 567794027.

It is not a de Polignac number, because 720497765 - 2² = 720497761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720497761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293945 + ... + 296385.

It is an arithmetic number, because the mean of its divisors is an integer number (30769200).

Almost surely, 2^720497765 is an apocalyptic number.

It is an amenable number.

720497765 is a deficient number, since it is larger than the sum of its proper divisors (264116635).

720497765 is a wasteful number, since it uses less digits than its factorization.

720497765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717.

The product of its (nonzero) digits is 740880, while the sum is 47.

The square root of 720497765 is about 26842.0894305939. The cubic root of 720497765 is about 896.4874467722.

The spelling of 720497765 in words is "seven hundred twenty million, four hundred ninety-seven thousand, seven hundred sixty-five".