720530 has 8 divisors (see below), whose sum is σ = 1296972. Its totient is φ = 288208.

The previous prime is 720527. The next prime is 720547. The reversal of 720530 is 35027.

It can be written as a sum of positive squares in 2 ways, for example, as 654481 + 66049 = 809^2 + 257^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 720499 and 720508.

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, 36017 + ... + 36036.

2⁷²⁰⁵³⁰ is an apocalyptic number.

720530 is a deficient number, since it is larger than the sum of its proper divisors (576442).

720530 is a wasteful number, since it uses less digits than its factorization.

720530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72060.

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 720530 is about 848.8403854671. The cubic root of 720530 is about 89.6500816160.

Adding to 720530 its reverse (35027), we get a palindrome (755557).

The spelling of 720530 in words is "seven hundred twenty thousand, five hundred thirty".