520563640 has 32 divisors (see below), whose sum is σ = 1172112480. Its totient is φ = 208075392.

The previous prime is 520563611. The next prime is 520563643. The reversal of 520563640 is 46365025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520563643) 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, 63877 + ... + 71563.

It is an arithmetic number, because the mean of its divisors is an integer number (36628515).

Almost surely, 2^520563640 is an apocalyptic number.

It is an amenable number.

520563640 is an abundant number, since it is smaller than the sum of its proper divisors (651548840).

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

520563640 is a wasteful number, since it uses less digits than its factorization.

520563640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391 (or 9387 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 520563640 is about 22815.8637793970. The cubic root of 520563640 is about 804.4355906343.

It can be divided in two parts, 52056 and 3640, that added together give a square (55696 = 236²).

The spelling of 520563640 in words is "five hundred twenty million, five hundred sixty-three thousand, six hundred forty".