669828 has 12 divisors (see below), whose sum is σ = 1562960. Its totient is φ = 223272.

The previous prime is 669791. The next prime is 669839. The reversal of 669828 is 828966.

669828 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a tau number, because it is divible by the number of its divisors (12).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669828.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27898 + ... + 27921.

2⁶⁶⁹⁸²⁸ is an apocalyptic number.

It is an amenable number.

669828 is an abundant number, since it is smaller than the sum of its proper divisors (893132).

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

669828 is a wasteful number, since it uses less digits than its factorization.

669828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55826 (or 55824 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 669828 is about 818.4302047212. The cubic root of 669828 is about 87.4959127343.

The spelling of 669828 in words is "six hundred sixty-nine thousand, eight hundred twenty-eight".