720752421647 has 4 divisors (see below), whose sum is σ = 720755642880. Its totient is φ = 720749200416.

The previous prime is 720752421619. The next prime is 720752421671. The reversal of 720752421647 is 746124257027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746124257027 = 631 ⋅1182447317.

It is a cyclic number.

It is not a de Polignac number, because 720752421647 - 2²⁰ = 720751373071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720752421617) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1247738 + ... + 1731575.

It is an arithmetic number, because the mean of its divisors is an integer number (180188910720).

Almost surely, 2^720752421647 is an apocalyptic number.

720752421647 is a deficient number, since it is larger than the sum of its proper divisors (3221233).

720752421647 is a wasteful number, since it uses less digits than its factorization.

720752421647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221232.

The product of its (nonzero) digits is 1317120, while the sum is 47.

The spelling of 720752421647 in words is "seven hundred twenty billion, seven hundred fifty-two million, four hundred twenty-one thousand, six hundred forty-seven".