720506 has 8 divisors (see below), whose sum is σ = 1084980. Its totient is φ = 358848.

The previous prime is 720497. The next prime is 720527. The reversal of 720506 is 605027.

It can be written as a sum of positive squares in 2 ways, for example, as 707281 + 13225 = 841^2 + 115^2 .

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

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, 140 + ... + 1208.

2⁷²⁰⁵⁰⁶ is an apocalyptic number.

720506 is a deficient number, since it is larger than the sum of its proper divisors (364474).

720506 is a wasteful number, since it uses less digits than its factorization.

720506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 720506 is about 848.8262484160. The cubic root of 720506 is about 89.6490862256.

The spelling of 720506 in words is "seven hundred twenty thousand, five hundred six".