669573 has 8 divisors (see below), whose sum is σ = 992000. Its totient is φ = 446364.

The previous prime is 669551. The next prime is 669577. The reversal of 669573 is 375966.

It is a happy number.

669573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-669573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12373 + ... + 12426.

It is an arithmetic number, because the mean of its divisors is an integer number (124000).

2⁶⁶⁹⁵⁷³ is an apocalyptic number.

It is an amenable number.

669573 is a deficient number, since it is larger than the sum of its proper divisors (322427).

669573 is a wasteful number, since it uses less digits than its factorization.

669573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24808 (or 24802 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 669573 is about 818.2744038524. The cubic root of 669573 is about 87.4848082469.

The spelling of 669573 in words is "six hundred sixty-nine thousand, five hundred seventy-three".