669635 has 8 divisors (see below), whose sum is σ = 808800. Its totient is φ = 532224.

The previous prime is 669611. The next prime is 669637. The reversal of 669635 is 536966.

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

It is a cyclic number.

It is not a de Polignac number, because 669635 - 2⁸ = 669379 is a prime.

It is a super-2 number, since 2×669635² = 896822066450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669595 and 669604.

It is not an unprimeable number, because it can be changed into a prime (669637) 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, 659 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (101100).

2⁶⁶⁹⁶³⁵ is an apocalyptic number.

669635 is a deficient number, since it is larger than the sum of its proper divisors (139165).

669635 is a wasteful number, since it uses less digits than its factorization.

669635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its digits is 29160, while the sum is 35.

The square root of 669635 is about 818.3122875773. The cubic root of 669635 is about 87.4875084209.

The spelling of 669635 in words is "six hundred sixty-nine thousand, six hundred thirty-five".