669624 has 16 divisors (see below), whose sum is σ = 1674120. Its totient is φ = 223200.

The previous prime is 669611. The next prime is 669637. The reversal of 669624 is 426966.

It is an interprime number because it is at equal distance from previous prime (669611) and next prime (669637).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13927 + ... + 13974.

2⁶⁶⁹⁶²⁴ is an apocalyptic number.

It is an amenable number.

669624 is an abundant number, since it is smaller than the sum of its proper divisors (1004496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669624 is a wasteful number, since it uses less digits than its factorization.

669624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27910 (or 27906 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 669624 is about 818.3055663993. The cubic root of 669624 is about 87.4870293699.

It can be divided in two parts, 66962 and 4, that added together give a palindrome (66966).

The spelling of 669624 in words is "six hundred sixty-nine thousand, six hundred twenty-four".