669724 has 24 divisors (see below), whose sum is σ = 1322496. Its totient is φ = 294000.

The previous prime is 669707. The next prime is 669733. The reversal of 669724 is 427966.

It is a self number, because there is not a number n which added to its sum of digits gives 669724.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1119 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (55104).

2⁶⁶⁹⁷²⁴ is an apocalyptic number.

It is an amenable number.

669724 is a deficient number, since it is larger than the sum of its proper divisors (652772).

669724 is a wasteful number, since it uses less digits than its factorization.

669724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 535 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 669724 is about 818.3666659878. The cubic root of 669724 is about 87.4913841857.

The spelling of 669724 in words is "six hundred sixty-nine thousand, seven hundred twenty-four".