320500000 has 84 divisors (see below), whose sum is σ = 789950826. Its totient is φ = 128000000.

The previous prime is 320499983. The next prime is 320500007. The reversal of 320500000 is 5023.

It can be written as a sum of positive squares in 7 ways, for example, as 97535376 + 222964624 = 9876^2 + 14932^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 320500000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320500007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499680 + ... + 500320.

Almost surely, 2^320500000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394975413).

320500000 is an abundant number, since it is smaller than the sum of its proper divisors (469450826).

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

320500000 is an frugal number, since it uses more digits than its factorization.

320500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 10.

The square root of 320500000 is about 17902.5137899682. The cubic root of 320500000 is about 684.3464382762.

Adding to 320500000 its reverse (5023), we get a palindrome (320505023).

The spelling of 320500000 in words is "three hundred twenty million, five hundred thousand".