720506509 has 8 divisors (see below), whose sum is σ = 731158272. Its totient is φ = 709868880.

The previous prime is 720506503. The next prime is 720506573. The reversal of 720506509 is 905605027.

720506509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720506509 - 2⁵ = 720506477 is a prime.

It is a super-2 number, since 2×720506509² = 1038259259022734162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720506503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143292 + ... + 148234.

It is an arithmetic number, because the mean of its divisors is an integer number (91394784).

Almost surely, 2^720506509 is an apocalyptic number.

It is an amenable number.

720506509 is a deficient number, since it is larger than the sum of its proper divisors (10651763).

720506509 is a wasteful number, since it uses less digits than its factorization.

720506509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 720506509 is about 26842.2523086272. The cubic root of 720506509 is about 896.4910733643.

The spelling of 720506509 in words is "seven hundred twenty million, five hundred six thousand, five hundred nine".