520743640 has 64 divisors (see below), whose sum is σ = 1237363200. Its totient is φ = 196691328.

The previous prime is 520743599. The next prime is 520743647. The reversal of 520743640 is 46347025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520743647) 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, 277987 + ... + 279853.

It is an arithmetic number, because the mean of its divisors is an integer number (19333800).

Almost surely, 2^520743640 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 520743640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618681600).

520743640 is an abundant number, since it is smaller than the sum of its proper divisors (716619560).

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

520743640 is a wasteful number, since it uses less digits than its factorization.

520743640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 520743640 is about 22819.8080622954. The cubic root of 520743640 is about 804.5282989406.

The spelling of 520743640 in words is "five hundred twenty million, seven hundred forty-three thousand, six hundred forty".