669079 has 4 divisors (see below), whose sum is σ = 685440. Its totient is φ = 652720.

The previous prime is 669077. The next prime is 669089. The reversal of 669079 is 970966.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 669079 - 2¹ = 669077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8119 + ... + 8200.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

2⁶⁶⁹⁰⁷⁹ is an apocalyptic number.

669079 is a deficient number, since it is larger than the sum of its proper divisors (16361).

669079 is a wasteful number, since it uses less digits than its factorization.

669079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16360.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 669079 is about 817.9724934251. The cubic root of 669079 is about 87.4632880004.

The spelling of 669079 in words is "six hundred sixty-nine thousand, seventy-nine".