520561440 has 288 divisors, whose sum is σ = 2079133056. Its totient is φ = 116121600.

The previous prime is 520561429. The next prime is 520561469. The reversal of 520561440 is 44165025.

520561440 is a `hidden beast` number, since 5 + 2 + 0 + 5 + 614 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 432840 + ... + 434040.

It is an arithmetic number, because the mean of its divisors is an integer number (7219212).

Almost surely, 2^520561440 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 520561440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039566528).

520561440 is an abundant number, since it is smaller than the sum of its proper divisors (1558571616).

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

520561440 is a wasteful number, since it uses less digits than its factorization.

520561440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 520561440 is about 22815.8155672770. The cubic root of 520561440 is about 804.4344574006.

The spelling of 520561440 in words is "five hundred twenty million, five hundred sixty-one thousand, four hundred forty".