669000687 has 4 divisors (see below), whose sum is σ = 892000920. Its totient is φ = 446000456.

The previous prime is 669000653. The next prime is 669000719. The reversal of 669000687 is 786000966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669000687 - 2⁷ = 669000559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669000617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111500112 + ... + 111500117.

It is an arithmetic number, because the mean of its divisors is an integer number (223000230).

Almost surely, 2^669000687 is an apocalyptic number.

669000687 is a deficient number, since it is larger than the sum of its proper divisors (223000233).

669000687 is a wasteful number, since it uses less digits than its factorization.

669000687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223000232.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 669000687 is about 25865.0475932290. The cubic root of 669000687 is about 874.5987545884.

The spelling of 669000687 in words is "six hundred sixty-nine million, six hundred eighty-seven", and thus it is an aban number.