667858 has 4 divisors (see below), whose sum is σ = 1001790. Its totient is φ = 333928.

The previous prime is 667837. The next prime is 667859. The reversal of 667858 is 858766.

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

It can be written as a sum of positive squares in only one way, i.e., 660969 + 6889 = 813^2 + 83^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 667858.

It is not an unprimeable number, because it can be changed into a prime (667859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166963 + ... + 166966.

2⁶⁶⁷⁸⁵⁸ is an apocalyptic number.

667858 is a deficient number, since it is larger than the sum of its proper divisors (333932).

667858 is a wasteful number, since it uses less digits than its factorization.

667858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333931.

The product of its digits is 80640, while the sum is 40.

The square root of 667858 is about 817.2257949918. The cubic root of 667858 is about 87.4100517844.

The spelling of 667858 in words is "six hundred sixty-seven thousand, eight hundred fifty-eight".