669652 has 6 divisors (see below), whose sum is σ = 1171898. Its totient is φ = 334824.

The previous prime is 669649. The next prime is 669659. The reversal of 669652 is 256966.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 7056 = 814^2 + 84^2 .

It is a super-2 number, since 2×669652² = 896867602208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669659) 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 as a sum of consecutive naturals, namely, 83703 + ... + 83710.

2⁶⁶⁹⁶⁵² is an apocalyptic number.

It is an amenable number.

669652 is a deficient number, since it is larger than the sum of its proper divisors (502246).

669652 is a wasteful number, since it uses less digits than its factorization.

669652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167417 (or 167415 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 669652 is about 818.3226747439. The cubic root of 669652 is about 87.4882487620.

Subtracting from 669652 its reverse (256966), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 669652 in words is "six hundred sixty-nine thousand, six hundred fifty-two".