669485 has 8 divisors (see below), whose sum is σ = 808056. Its totient is φ = 532480.

The previous prime is 669481. The next prime is 669527. The reversal of 669485 is 584966.

It can be written as a sum of positive squares in 4 ways, for example, as 178084 + 491401 = 422^2 + 701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 669485 - 2² = 669481 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669481) 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 7 ways as a sum of consecutive naturals, for example, 1025 + ... + 1545.

It is an arithmetic number, because the mean of its divisors is an integer number (101007).

2⁶⁶⁹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

669485 is a deficient number, since it is larger than the sum of its proper divisors (138571).

669485 is a wasteful number, since it uses less digits than its factorization.

669485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

The product of its digits is 51840, while the sum is 38.

The square root of 669485 is about 818.2206303926. The cubic root of 669485 is about 87.4809754558.

The spelling of 669485 in words is "six hundred sixty-nine thousand, four hundred eighty-five".