669550 has 24 divisors (see below), whose sum is σ = 1424016. Its totient is φ = 229440.

The previous prime is 669527. The next prime is 669551. The reversal of 669550 is 55966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669551) by changing a digit.

669550 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 11 ways as a sum of consecutive naturals, for example, 607 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (59334).

2⁶⁶⁹⁵⁵⁰ is an apocalyptic number.

669550 is an abundant number, since it is smaller than the sum of its proper divisors (754466).

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

669550 is a wasteful number, since it uses less digits than its factorization.

669550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 669550 is about 818.2603497665. The cubic root of 669550 is about 87.4838065271.

The spelling of 669550 in words is "six hundred sixty-nine thousand, five hundred fifty".