720730 has 8 divisors (see below), whose sum is σ = 1297332. Its totient is φ = 288288.

The previous prime is 720703. The next prime is 720743. The reversal of 720730 is 37027.

It can be written as a sum of positive squares in 2 ways, for example, as 687241 + 33489 = 829^2 + 183^2 .

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

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 720698 and 720707.

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, 36027 + ... + 36046.

2⁷²⁰⁷³⁰ is an apocalyptic number.

720730 is a deficient number, since it is larger than the sum of its proper divisors (576602).

720730 is a wasteful number, since it uses less digits than its factorization.

720730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72080.

The product of its (nonzero) digits is 294, while the sum is 19.

The square root of 720730 is about 848.9581850716. The cubic root of 720730 is about 89.6583756762.

Adding to 720730 its reverse (37027), we get a palindrome (757757).

The spelling of 720730 in words is "seven hundred twenty thousand, seven hundred thirty".