523664 has 20 divisors (see below), whose sum is σ = 1059456. Its totient is φ = 250272.

The previous prime is 523657. The next prime is 523667. The reversal of 523664 is 466325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344 + ... + 1079.

2⁵²³⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

523664 is an abundant number, since it is smaller than the sum of its proper divisors (535792).

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

523664 is a wasteful number, since it uses less digits than its factorization.

523664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1448 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 523664 is about 723.6463224532. The cubic root of 523664 is about 80.6029443105.

Adding to 523664 its reverse (466325), we get a palindrome (989989).

The spelling of 523664 in words is "five hundred twenty-three thousand, six hundred sixty-four".