669725 has 24 divisors (see below), whose sum is σ = 982080. Its totient is φ = 443520.

The previous prime is 669707. The next prime is 669733. The reversal of 669725 is 527966.

It is not a de Polignac number, because 669725 - 2⁶ = 669661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7481 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (40920).

2⁶⁶⁹⁷²⁵ is an apocalyptic number.

It is an amenable number.

669725 is a deficient number, since it is larger than the sum of its proper divisors (312355).

669725 is a wasteful number, since it uses less digits than its factorization.

669725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 144 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 669725 is about 818.3672769607. The cubic root of 669725 is about 87.4914277316.

The spelling of 669725 in words is "six hundred sixty-nine thousand, seven hundred twenty-five".