669764 has 6 divisors (see below), whose sum is σ = 1172094. Its totient is φ = 334880.

The previous prime is 669763. The next prime is 669787. The reversal of 669764 is 467966.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 16900 = 808^2 + 130^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669764.

It is not an unprimeable number, because it can be changed into a prime (669763) by changing a digit.

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 as a sum of consecutive naturals, namely, 83717 + ... + 83724.

It is an arithmetic number, because the mean of its divisors is an integer number (195349).

2⁶⁶⁹⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

669764 is a deficient number, since it is larger than the sum of its proper divisors (502330).

669764 is a wasteful number, since it uses less digits than its factorization.

669764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167445 (or 167443 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 669764 is about 818.3911045460. The cubic root of 669764 is about 87.4931259906.

The spelling of 669764 in words is "six hundred sixty-nine thousand, seven hundred sixty-four".