720580613 has 4 divisors (see below), whose sum is σ = 720636000. Its totient is φ = 720525228.

The previous prime is 720580583. The next prime is 720580621. The reversal of 720580613 is 316085027.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 316085027 = 139 ⋅2273993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720580613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720580613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720580673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3638 + ... + 38136.

It is an arithmetic number, because the mean of its divisors is an integer number (180159000).

Almost surely, 2^720580613 is an apocalyptic number.

It is an amenable number.

720580613 is a deficient number, since it is larger than the sum of its proper divisors (55387).

720580613 is a wasteful number, since it uses less digits than its factorization.

720580613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55386.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 720580613 is about 26843.6326342021. The cubic root of 720580613 is about 896.5218069738.

The spelling of 720580613 in words is "seven hundred twenty million, five hundred eighty thousand, six hundred thirteen".