669860 has 12 divisors (see below), whose sum is σ = 1406748. Its totient is φ = 267936.

The previous prime is 669859. The next prime is 669863. The reversal of 669860 is 68966.

It can be written as a sum of positive squares in 2 ways, for example, as 529984 + 139876 = 728^2 + 374^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 669860.

It is not an unprimeable number, because it can be changed into a prime (669863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16727 + ... + 16766.

It is an arithmetic number, because the mean of its divisors is an integer number (117229).

2⁶⁶⁹⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

669860 is an abundant number, since it is smaller than the sum of its proper divisors (736888).

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

669860 is a wasteful number, since it uses less digits than its factorization.

669860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33502 (or 33500 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 669860 is about 818.4497541083. The cubic root of 669860 is about 87.4973060395.

The spelling of 669860 in words is "six hundred sixty-nine thousand, eight hundred sixty".