669798 has 24 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 220752.

The previous prime is 669791. The next prime is 669839. The reversal of 669798 is 897966.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669798.

It is not an unprimeable number, because it can be changed into a prime (669791) by changing a digit.

669798 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, 2140 + ... + 2432.

It is an arithmetic number, because the mean of its divisors is an integer number (61152).

2⁶⁶⁹⁷⁹⁸ is an apocalyptic number.

669798 is an abundant number, since it is smaller than the sum of its proper divisors (797850).

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

669798 is a wasteful number, since it uses less digits than its factorization.

669798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 425 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 669798 is about 818.4118767467. The cubic root of 669798 is about 87.4946064703.

The spelling of 669798 in words is "six hundred sixty-nine thousand, seven hundred ninety-eight".