669977 has 18 divisors (see below), whose sum is σ = 864234. Its totient is φ = 517440.

The previous prime is 669971. The next prime is 669989. The reversal of 669977 is 779966.

It can be written as a sum of positive squares in only one way, i.e., 379456 + 290521 = 616^2 + 539^2 .

It is not a de Polignac number, because 669977 - 2⁶ = 669913 is a prime.

It is a zygodrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669977.

It is not an unprimeable number, because it can be changed into a prime (669971) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5873 + ... + 5985.

It is an arithmetic number, because the mean of its divisors is an integer number (48013).

2⁶⁶⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

669977 is a deficient number, since it is larger than the sum of its proper divisors (194257).

669977 is a wasteful number, since it uses less digits than its factorization.

669977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 131 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 669977 is about 818.5212275806. The cubic root of 669977 is about 87.5023999342.

It can be divided in two parts, 6699 and 77, that added together give a palindrome (6776).

The spelling of 669977 in words is "six hundred sixty-nine thousand, nine hundred seventy-seven".