669504 has 56 divisors (see below), whose sum is σ = 1938528. Its totient is φ = 202240.

The previous prime is 669481. The next prime is 669527. The reversal of 669504 is 405966.

It is an interprime number because it is at equal distance from previous prime (669481) and next prime (669527).

It is a congruent number.

It is an unprimeable number.

669504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1954 + ... + 2270.

2⁶⁶⁹⁵⁰⁴ is an apocalyptic number.

669504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969264).

669504 is an abundant number, since it is smaller than the sum of its proper divisors (1269024).

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

669504 is a wasteful number, since it uses less digits than its factorization.

669504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 669504 is about 818.2322408705. The cubic root of 669504 is about 87.4818030186.

It can be divided in two parts, 66 and 9504, that multiplied together give a square (627264 = 792²).

The spelling of 669504 in words is "six hundred sixty-nine thousand, five hundred four".