669975 has 12 divisors (see below), whose sum is σ = 1107816. Its totient is φ = 357280.

The previous prime is 669971. The next prime is 669989. The reversal of 669975 is 579966.

669975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669975 - 2² = 669971 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669975.

It is not an unprimeable number, because it can be changed into a prime (669971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4392 + ... + 4541.

It is an arithmetic number, because the mean of its divisors is an integer number (92318).

2⁶⁶⁹⁹⁷⁵ is an apocalyptic number.

669975 is a deficient number, since it is larger than the sum of its proper divisors (437841).

669975 is a wasteful number, since it uses less digits than its factorization.

669975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8946 (or 8941 counting only the distinct ones).

The product of its digits is 102060, while the sum is 42.

The square root of 669975 is about 818.5200058642. The cubic root of 669975 is about 87.5023128640.

Subtracting from 669975 its reverse (579966), we obtain a palindrome (90009).

The spelling of 669975 in words is "six hundred sixty-nine thousand, nine hundred seventy-five".