320523540 has 96 divisors (see below), whose sum is σ = 956928000. Its totient is φ = 79926912.

The previous prime is 320523499. The next prime is 320523557. The reversal of 320523540 is 45325023.

It is a self number, because there is not a number n which added to its sum of digits gives 320523540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88281 + ... + 91839.

It is an arithmetic number, because the mean of its divisors is an integer number (9968000).

Almost surely, 2^320523540 is an apocalyptic number.

320523540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320523540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (478464000).

320523540 is an abundant number, since it is smaller than the sum of its proper divisors (636404460).

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

320523540 is a wasteful number, since it uses less digits than its factorization.

320523540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669 (or 3667 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 320523540 is about 17903.1712274669. The cubic root of 320523540 is about 684.3631924320.

Adding to 320523540 its reverse (45325023), we get a palindrome (365848563).

The spelling of 320523540 in words is "three hundred twenty million, five hundred twenty-three thousand, five hundred forty".