669544 has 16 divisors (see below), whose sum is σ = 1267200. Its totient is φ = 331632.

The previous prime is 669527. The next prime is 669551. The reversal of 669544 is 445966.

669544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

669544 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (79200).

2⁶⁶⁹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

669544 is a deficient number, since it is larger than the sum of its proper divisors (597656).

669544 is a wasteful number, since it uses less digits than its factorization.

669544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 788 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 669544 is about 818.2566834435. The cubic root of 669544 is about 87.4835452051.

The spelling of 669544 in words is "six hundred sixty-nine thousand, five hundred forty-four".