730820 has 12 divisors (see below), whose sum is σ = 1534764. Its totient is φ = 292320.

The previous prime is 730819. The next prime is 730823. The reversal of 730820 is 28037.

It can be written as a sum of positive squares in 2 ways, for example, as 515524 + 215296 = 718^2 + 464^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 36541 = 730820 / (7 + 3 + 0 + 8 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 730792 and 730801.

It is not an unprimeable number, because it can be changed into a prime (730823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18251 + ... + 18290.

It is an arithmetic number, because the mean of its divisors is an integer number (127897).

2⁷³⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

730820 is an abundant number, since it is smaller than the sum of its proper divisors (803944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

730820 is a wasteful number, since it uses less digits than its factorization.

730820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36550 (or 36548 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 730820 is about 854.8801085532. The cubic root of 730820 is about 90.0748348770.

Adding to 730820 its reverse (28037), we get a palindrome (758857).

The spelling of 730820 in words is "seven hundred thirty thousand, eight hundred twenty".