720505 has 8 divisors (see below), whose sum is σ = 894600. Its totient is φ = 556416.

The previous prime is 720497. The next prime is 720527. The reversal of 720505 is 505027.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 698896 = 147^2 + 836^2 .

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 720505 - 2³ = 720497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340 + ... + 2629.

It is an arithmetic number, because the mean of its divisors is an integer number (111825).

2⁷²⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

720505 is a deficient number, since it is larger than the sum of its proper divisors (174095).

720505 is a wasteful number, since it uses less digits than its factorization.

720505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003.

The product of its (nonzero) digits is 350, while the sum is 19.

The square root of 720505 is about 848.8256593671. The cubic root of 720505 is about 89.6490447506.

It can be divided in two parts, 720 and 505, that added together give a triangular number (1225 = T₄₉).

The spelling of 720505 in words is "seven hundred twenty thousand, five hundred five".