531728 has 20 divisors (see below), whose sum is σ = 1041600. Its totient is φ = 262944.

The previous prime is 531701. The next prime is 531731. The reversal of 531728 is 827135.

It is a junction number, because it is equal to n+sod(n) for n = 531697 and 531706.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 2771.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2⁵³¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

531728 is a deficient number, since it is larger than the sum of its proper divisors (509872).

531728 is a wasteful number, since it uses less digits than its factorization.

531728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 531728 is about 729.1968184242. The cubic root of 531728 is about 81.0145784866.

The spelling of 531728 in words is "five hundred thirty-one thousand, seven hundred twenty-eight".