503445320 has 64 divisors (see below), whose sum is σ = 1301287680. Its totient is φ = 171714816.

The previous prime is 503445287. The next prime is 503445329. The reversal of 503445320 is 23544305.

It is a self number, because there is not a number n which added to its sum of digits gives 503445320.

It is not an unprimeable number, because it can be changed into a prime (503445329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50597 + ... + 59723.

It is an arithmetic number, because the mean of its divisors is an integer number (20332620).

Almost surely, 2^503445320 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 503445320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (650643840).

503445320 is an abundant number, since it is smaller than the sum of its proper divisors (797842360).

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

503445320 is a wasteful number, since it uses less digits than its factorization.

503445320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342 (or 9338 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 503445320 is about 22437.5872143152. The cubic root of 503445320 is about 795.5193895122.

Adding to 503445320 its reverse (23544305), we get a palindrome (526989625).

The spelling of 503445320 in words is "five hundred three million, four hundred forty-five thousand, three hundred twenty".