520809450 has 192 divisors, whose sum is σ = 1581327360. Its totient is φ = 110730240.

The previous prime is 520809431. The next prime is 520809503. The reversal of 520809450 is 54908025.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2909461 + ... + 2909639.

It is an arithmetic number, because the mean of its divisors is an integer number (8236080).

Almost surely, 2^520809450 is an apocalyptic number.

520809450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 520809450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790663680).

520809450 is an abundant number, since it is smaller than the sum of its proper divisors (1060517910).

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

520809450 is a wasteful number, since it uses less digits than its factorization.

520809450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 520809450 is about 22821.2499657666. The cubic root of 520809450 is about 804.5621887941.

The spelling of 520809450 in words is "five hundred twenty million, eight hundred nine thousand, four hundred fifty".