669776 has 20 divisors (see below), whose sum is σ = 1330644. Its totient is φ = 326400.

The previous prime is 669763. The next prime is 669787. The reversal of 669776 is 677966.

It can be written as a sum of positive squares in 2 ways, for example, as 179776 + 490000 = 424^2 + 700^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

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 669776.

It is an unprimeable number.

669776 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 146 + ... + 1166.

2⁶⁶⁹⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

669776 is a deficient number, since it is larger than the sum of its proper divisors (660868).

669776 is a wasteful number, since it uses less digits than its factorization.

669776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070 (or 1064 counting only the distinct ones).

The product of its digits is 95256, while the sum is 41.

The square root of 669776 is about 818.3984359711. The cubic root of 669776 is about 87.4936485186.

The spelling of 669776 in words is "six hundred sixty-nine thousand, seven hundred seventy-six".