669887 has 2 divisors, whose sum is σ = 669888. Its totient is φ = 669886.

The previous prime is 669869. The next prime is 669901. The reversal of 669887 is 788966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669887 - 2¹⁴ = 653503 is a prime.

It is a Chen prime.

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 669887.

It is not a weakly prime, because it can be changed into another prime (669847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334943 + 334944.

It is an arithmetic number, because the mean of its divisors is an integer number (334944).

2⁶⁶⁹⁸⁸⁷ is an apocalyptic number.

669887 is a deficient number, since it is larger than the sum of its proper divisors (1).

669887 is an equidigital number, since it uses as much as digits as its factorization.

669887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 669887 is about 818.4662485405. The cubic root of 669887 is about 87.4984816063.

The spelling of 669887 in words is "six hundred sixty-nine thousand, eight hundred eighty-seven".