520520400 has 90 divisors (see below), whose sum is σ = 1806362870. Its totient is φ = 138804480.

The previous prime is 520520359. The next prime is 520520419. The reversal of 520520400 is 4025025.

It can be written as a sum of positive squares in 3 ways, for example, as 1774224 + 518746176 = 1332^2 + 22776^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68695 + ... + 75894.

Almost surely, 2^520520400 is an apocalyptic number.

520520400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

520520400 is an abundant number, since it is smaller than the sum of its proper divisors (1285842470).

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

520520400 is a wasteful number, since it uses less digits than its factorization.

520520400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144613 (or 144599 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 520520400 is about 22814.9161734160. The cubic root of 520520400 is about 804.4133168555.

Adding to 520520400 its reverse (4025025), we get a palindrome (524545425).

The spelling of 520520400 in words is "five hundred twenty million, five hundred twenty thousand, four hundred".