730561 has 4 divisors (see below), whose sum is σ = 786772. Its totient is φ = 674352.

The previous prime is 730559. The next prime is 730567. The reversal of 730561 is 165037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40000 + 690561 = 200^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 730561 - 2¹ = 730559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (730567) 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, 28086 + ... + 28111.

It is an arithmetic number, because the mean of its divisors is an integer number (196693).

2⁷³⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

730561 is a deficient number, since it is larger than the sum of its proper divisors (56211).

730561 is a wasteful number, since it uses less digits than its factorization.

730561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56210.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 730561 is about 854.7286118997. The cubic root of 730561 is about 90.0641928864.

Adding to 730561 its reverse (165037), we get a palindrome (895598).

The spelling of 730561 in words is "seven hundred thirty thousand, five hundred sixty-one".