720489993 has 4 divisors (see below), whose sum is σ = 960653328. Its totient is φ = 480326660.

The previous prime is 720489989. The next prime is 720490021. The reversal of 720489993 is 399984027.

720489993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 720489993 - 2² = 720489989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720489293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120081663 + ... + 120081668.

It is an arithmetic number, because the mean of its divisors is an integer number (240163332).

Almost surely, 2^720489993 is an apocalyptic number.

It is an amenable number.

720489993 is a deficient number, since it is larger than the sum of its proper divisors (240163335).

720489993 is a wasteful number, since it uses less digits than its factorization.

720489993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240163334.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 720489993 is about 26841.9446575691. The cubic root of 720489993 is about 896.4842232945.

The spelling of 720489993 in words is "seven hundred twenty million, four hundred eighty-nine thousand, nine hundred ninety-three".