669057 has 4 divisors (see below), whose sum is σ = 892080. Its totient is φ = 446036.

The previous prime is 669049. The next prime is 669077. The reversal of 669057 is 750966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669057 - 2³ = 669049 is a prime.

It is a D-number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111507 + ... + 111512.

It is an arithmetic number, because the mean of its divisors is an integer number (223020).

2⁶⁶⁹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

669057 is a deficient number, since it is larger than the sum of its proper divisors (223023).

669057 is a wasteful number, since it uses less digits than its factorization.

669057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223022.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 669057 is about 817.9590454295. The cubic root of 669057 is about 87.4623293625.

The spelling of 669057 in words is "six hundred sixty-nine thousand, fifty-seven".