669736 has 8 divisors (see below), whose sum is σ = 1255770. Its totient is φ = 334864.

The previous prime is 669733. The next prime is 669763. The reversal of 669736 is 637966.

It can be written as a sum of positive squares in only one way, i.e., 367236 + 302500 = 606^2 + 550^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 669695 and 669704.

It is not an unprimeable number, because it can be changed into a prime (669733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41851 + ... + 41866.

2⁶⁶⁹⁷³⁶ is an apocalyptic number.

It is an amenable number.

669736 is a deficient number, since it is larger than the sum of its proper divisors (586034).

669736 is a wasteful number, since it uses less digits than its factorization.

669736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83723 (or 83719 counting only the distinct ones).

The product of its digits is 40824, while the sum is 37.

The square root of 669736 is about 818.3739976319. The cubic root of 669736 is about 87.4919067344.

The spelling of 669736 in words is "six hundred sixty-nine thousand, seven hundred thirty-six".