720651506 has 8 divisors (see below), whose sum is σ = 1107342684. Its totient is φ = 351537280.

The previous prime is 720651487. The next prime is 720651523. The reversal of 720651506 is 605156027.

It is a happy number.

720651506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 699867025 + 20784481 = 26455^2 + 4559^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4394135 + ... + 4394298.

Almost surely, 2^720651506 is an apocalyptic number.

720651506 is a deficient number, since it is larger than the sum of its proper divisors (386691178).

720651506 is a wasteful number, since it uses less digits than its factorization.

720651506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8788476.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 720651506 is about 26844.9530824697. The cubic root of 720651506 is about 896.5512068934.

The spelling of 720651506 in words is "seven hundred twenty million, six hundred fifty-one thousand, five hundred six".