667899 has 16 divisors (see below), whose sum is σ = 1024800. Its totient is φ = 429408.

The previous prime is 667883. The next prime is 667903. The reversal of 667899 is 998766.

It is not a de Polignac number, because 667899 - 2⁴ = 667883 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (667819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (64050).

2⁶⁶⁷⁸⁹⁹ is an apocalyptic number.

667899 is a deficient number, since it is larger than the sum of its proper divisors (356901).

667899 is a wasteful number, since it uses less digits than its factorization.

667899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 885 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 667899 is about 817.2508794734. The cubic root of 667899 is about 87.4118404575.

The spelling of 667899 in words is "six hundred sixty-seven thousand, eight hundred ninety-nine".