520435840 has 128 divisors (see below), whose sum is σ = 1323878400. Its totient is φ = 195084288.

The previous prime is 520435831. The next prime is 520435847. The reversal of 520435840 is 48534025.

520435840 = 1961² + 1962² + ... + 2087².

520435840 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (520435847) 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 15 ways as a sum of consecutive naturals, for example, 1544152 + ... + 1544488.

It is an arithmetic number, because the mean of its divisors is an integer number (10342800).

Almost surely, 2^520435840 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 520435840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661939200).

520435840 is an abundant number, since it is smaller than the sum of its proper divisors (803442560).

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

520435840 is a wasteful number, since it uses less digits than its factorization.

520435840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 520435840 is about 22813.0629245614. The cubic root of 520435840 is about 804.3697547628.

Adding to 520435840 its reverse (48534025), we get a palindrome (568969865).

The spelling of 520435840 in words is "five hundred twenty million, four hundred thirty-five thousand, eight hundred forty".