320730005 has 8 divisors (see below), whose sum is σ = 390620832. Its totient is φ = 252754128.

The previous prime is 320730001. The next prime is 320730019. The reversal of 320730005 is 500037023.

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 320730005 - 2² = 320730001 is a prime.

It is a super-2 number, since 2×320730005² = 205735472214600050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320730001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478367 + ... + 479036.

It is an arithmetic number, because the mean of its divisors is an integer number (48827604).

Almost surely, 2^320730005 is an apocalyptic number.

It is an amenable number.

320730005 is a deficient number, since it is larger than the sum of its proper divisors (69890827).

320730005 is an equidigital number, since it uses as much as digits as its factorization.

320730005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957475.

The product of its (nonzero) digits is 630, while the sum is 20.

The square root of 320730005 is about 17908.9364564175. The cubic root of 320730005 is about 684.5101049058.

Adding to 320730005 its reverse (500037023), we get a palindrome (820767028).

The spelling of 320730005 in words is "three hundred twenty million, seven hundred thirty thousand, five".