522728 has 24 divisors (see below), whose sum is σ = 1040130. Its totient is φ = 246240.

The previous prime is 522719. The next prime is 522737. The reversal of 522728 is 827225.

It is a Cunningham number, because it is equal to 723²-1.

It is an interprime number because it is at equal distance from previous prime (522719) and next prime (522737).

It can be written as a sum of positive squares in only one way, i.e., 521284 + 1444 = 722^2 + 38^2 .

It is a d-powerful number, because it can be written as 5⁸ + 2⁹ + 7 + 2¹⁶ + 2¹⁶ + 8³ .

It is a junction number, because it is equal to n+sod(n) for n = 522697 and 522706.

It is an unprimeable number.

522728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2798 + ... + 2978.

2⁵²²⁷²⁸ is an apocalyptic number.

It is an amenable number.

522728 is a deficient number, since it is larger than the sum of its proper divisors (517402).

522728 is a wasteful number, since it uses less digits than its factorization.

522728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 202 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 522728 is about 722.9993084367. Note that the first 3 decimals coincide. The cubic root of 522728 is about 80.5548922833.

The spelling of 522728 in words is "five hundred twenty-two thousand, seven hundred twenty-eight".