320640363 has 10 divisors (see below), whose sum is σ = 478981404. Its totient is φ = 213760188.

The previous prime is 320640361. The next prime is 320640391. The reversal of 320640363 is 363046023.

It is not a de Polignac number, because 320640363 - 2¹ = 320640361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (320640361) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1979181 + ... + 1979342.

Almost surely, 2^320640363 is an apocalyptic number.

320640363 is a deficient number, since it is larger than the sum of its proper divisors (158341041).

320640363 is an equidigital number, since it uses as much as digits as its factorization.

320640363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958535 (or 3958526 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

The square root of 320640363 is about 17906.4335645041. The cubic root of 320640363 is about 684.4463268876.

Adding to 320640363 its reverse (363046023), we get a palindrome (683686386).

The spelling of 320640363 in words is "three hundred twenty million, six hundred forty thousand, three hundred sixty-three".