320640345 has 24 divisors (see below), whose sum is σ = 567605376. Its totient is φ = 167368608.

The previous prime is 320640343. The next prime is 320640361. The reversal of 320640345 is 543046023.

It is not a de Polignac number, because 320640345 - 2¹ = 320640343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320640343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73687 + ... + 77916.

It is an arithmetic number, because the mean of its divisors is an integer number (23650224).

Almost surely, 2^320640345 is an apocalyptic number.

It is an amenable number.

320640345 is a deficient number, since it is larger than the sum of its proper divisors (246965031).

320640345 is a wasteful number, since it uses less digits than its factorization.

320640345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151661 (or 151658 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 320640345 is about 17906.4330618915. The cubic root of 320640345 is about 684.4463140798.

Adding to 320640345 its reverse (543046023), we get a palindrome (863686368).

The spelling of 320640345 in words is "three hundred twenty million, six hundred forty thousand, three hundred forty-five".