320534640 has 60 divisors (see below), whose sum is σ = 1076464584. Its totient is φ = 85475712.

The previous prime is 320534587. The next prime is 320534681. The reversal of 320534640 is 46435023.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221874 + ... + 223313.

Almost surely, 2^320534640 is an apocalyptic number.

320534640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320534640 is an abundant number, since it is smaller than the sum of its proper divisors (755929944).

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

320534640 is a wasteful number, since it uses less digits than its factorization.

320534640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445206 (or 445197 counting only the distinct ones).

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

The square root of 320534640 is about 17903.4812257281. The cubic root of 320534640 is about 684.3710923653.

Adding to 320534640 its reverse (46435023), we get a palindrome (366969663).

The spelling of 320534640 in words is "three hundred twenty million, five hundred thirty-four thousand, six hundred forty".