669877 has 6 divisors (see below), whose sum is σ = 724598. Its totient is φ = 615624.

The previous prime is 669869. The next prime is 669887. The reversal of 669877 is 778966.

669877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 206116 = 681^2 + 454^2 .

It is not a de Polignac number, because 669877 - 2³ = 669869 is a prime.

It is a Duffinian number.

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 669877.

It is not an unprimeable number, because it can be changed into a prime (669847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2838 + ... + 3064.

2⁶⁶⁹⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

669877 is a deficient number, since it is larger than the sum of its proper divisors (54721).

669877 is an equidigital number, since it uses as much as digits as its factorization.

669877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 240 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 669877 is about 818.4601395303. The cubic root of 669877 is about 87.4980462149.

The spelling of 669877 in words is "six hundred sixty-nine thousand, eight hundred seventy-seven".