520440740 has 24 divisors (see below), whose sum is σ = 1095336312. Its totient is φ = 207717120.

The previous prime is 520440733. The next prime is 520440763. The reversal of 520440740 is 47044025.

It can be written as a sum of positive squares in 4 ways, for example, as 134003776 + 386436964 = 11576^2 + 19658^2 .

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, 19331 + ... + 37610.

It is an arithmetic number, because the mean of its divisors is an integer number (45639013).

Almost surely, 2^520440740 is an apocalyptic number.

It is an amenable number.

520440740 is an abundant number, since it is smaller than the sum of its proper divisors (574895572).

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

520440740 is a wasteful number, since it uses less digits than its factorization.

520440740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57407 (or 57405 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 520440740 is about 22813.1703189189. The cubic root of 520440740 is about 804.3722791850.

Adding to 520440740 its reverse (47044025), we get a palindrome (567484765).

The spelling of 520440740 in words is "five hundred twenty million, four hundred forty thousand, seven hundred forty".