520315440 has 80 divisors (see below), whose sum is σ = 1618396416. Its totient is φ = 138284800.

The previous prime is 520315403. The next prime is 520315489. The reversal of 520315440 is 44513025.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 520315440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71155 + ... + 78125.

Almost surely, 2^520315440 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 520315440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809198208).

520315440 is an abundant number, since it is smaller than the sum of its proper divisors (1098080976).

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

520315440 is a wasteful number, since it uses less digits than its factorization.

520315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298 (or 7292 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 520315440 is about 22810.4239329303. The cubic root of 520315440 is about 804.3077211234.

Adding to 520315440 its reverse (44513025), we get a palindrome (564828465).

The spelling of 520315440 in words is "five hundred twenty million, three hundred fifteen thousand, four hundred forty".