520743040 has 64 divisors (see below), whose sum is σ = 1249599960. Its totient is φ = 207511552.

The previous prime is 520743037. The next prime is 520743049. The reversal of 520743040 is 40347025.

It can be written as a sum of positive squares in 4 ways, for example, as 449779264 + 70963776 = 21208^2 + 8424^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 520742996 and 520743014.

It is not an unprimeable number, because it can be changed into a prime (520743049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186132 + ... + 188908.

Almost surely, 2^520743040 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 520743040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624799980).

520743040 is an abundant number, since it is smaller than the sum of its proper divisors (728856920).

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

520743040 is a wasteful number, since it uses less digits than its factorization.

520743040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 520743040 is about 22819.7949158182. The cubic root of 520743040 is about 804.5279899484.

The spelling of 520743040 in words is "five hundred twenty million, seven hundred forty-three thousand, forty".