521828 has 6 divisors (see below), whose sum is σ = 913206. Its totient is φ = 260912.

The previous prime is 521819. The next prime is 521831. The reversal of 521828 is 828125.

It can be written as a sum of positive squares in only one way, i.e., 506944 + 14884 = 712^2 + 122^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 5⁸ + 2 + 8² + 1 + 2¹⁷ + 8² .

It is a junction number, because it is equal to n+sod(n) for n = 521797 and 521806.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521828.

It is an unprimeable number.

521828 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65225 + ... + 65232.

It is an arithmetic number, because the mean of its divisors is an integer number (152201).

2⁵²¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

521828 is a deficient number, since it is larger than the sum of its proper divisors (391378).

521828 is a wasteful number, since it uses less digits than its factorization.

521828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130461 (or 130459 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 521828 is about 722.3766330662. The cubic root of 521828 is about 80.5086342860.

The spelling of 521828 in words is "five hundred twenty-one thousand, eight hundred twenty-eight".