720652663 has 4 divisors (see below), whose sum is σ = 740129800. Its totient is φ = 701175528.

The previous prime is 720652657. The next prime is 720652679. The reversal of 720652663 is 366256027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366256027 = 19 ⋅19276633.

It is a cyclic number.

It is not a de Polignac number, because 720652663 - 2⁵ = 720652631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 19477099 = 720652663 / (7 + 2 + 0 + 6 + 5 + 2 + 6 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720652643) 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 3 ways as a sum of consecutive naturals, for example, 9738513 + ... + 9738586.

It is an arithmetic number, because the mean of its divisors is an integer number (185032450).

Almost surely, 2^720652663 is an apocalyptic number.

720652663 is a deficient number, since it is larger than the sum of its proper divisors (19477137).

720652663 is a wasteful number, since it uses less digits than its factorization.

720652663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19477136.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 720652663 is about 26844.9746321355. The cubic root of 720652663 is about 896.5516866950.

The spelling of 720652663 in words is "seven hundred twenty million, six hundred fifty-two thousand, six hundred sixty-three".