728523 has 12 divisors (see below), whose sum is σ = 1070368. Its totient is φ = 477360.

The previous prime is 728521. The next prime is 728527. The reversal of 728523 is 325827.

It is not a de Polignac number, because 728523 - 2¹ = 728521 is a prime.

It is a Duffinian number.

728523 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115 + ... + 1212.

2⁷²⁸⁵²³ is an apocalyptic number.

728523 is a deficient number, since it is larger than the sum of its proper divisors (341845).

728523 is a wasteful number, since it uses less digits than its factorization.

728523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394 (or 1391 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 728523 is about 853.5355880102. The cubic root of 728523 is about 89.9803660875.

The spelling of 728523 in words is "seven hundred twenty-eight thousand, five hundred twenty-three".