520233728 has 72 divisors (see below), whose sum is σ = 1256667552. Its totient is φ = 209829888.

The previous prime is 520233691. The next prime is 520233731. The reversal of 520233728 is 827332025.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 520233694 and 520233703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21926 + ... + 39002.

It is an arithmetic number, because the mean of its divisors is an integer number (17453716).

Almost surely, 2^520233728 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 520233728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628333776).

520233728 is an abundant number, since it is smaller than the sum of its proper divisors (736433824).

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

520233728 is a wasteful number, since it uses less digits than its factorization.

520233728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17117 (or 17103 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 520233728 is about 22808.6327516579. The cubic root of 520233728 is about 804.2656152339.

The spelling of 520233728 in words is "five hundred twenty million, two hundred thirty-three thousand, seven hundred twenty-eight".