667864 has 16 divisors (see below), whose sum is σ = 1293120. Its totient is φ = 323040.

The previous prime is 667861. The next prime is 667867. The reversal of 667864 is 468766.

It is an interprime number because it is at equal distance from previous prime (667861) and next prime (667867).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099 + ... + 1594.

It is an arithmetic number, because the mean of its divisors is an integer number (80820).

2⁶⁶⁷⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

667864 is a deficient number, since it is larger than the sum of its proper divisors (625256).

667864 is a wasteful number, since it uses less digits than its factorization.

667864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2726 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 667864 is about 817.2294659396. The cubic root of 667864 is about 87.4103135460.

The spelling of 667864 in words is "six hundred sixty-seven thousand, eight hundred sixty-four".