667684 has 12 divisors (see below), whose sum is σ = 1185408. Its totient is φ = 329000.

The previous prime is 667673. The next prime is 667687. The reversal of 667684 is 486766.

It is not an unprimeable number, because it can be changed into a prime (667687) 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, 892 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (98784).

2⁶⁶⁷⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

667684 is a deficient number, since it is larger than the sum of its proper divisors (517724).

667684 is a wasteful number, since it uses less digits than its factorization.

667684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426 (or 2424 counting only the distinct ones).

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

The square root of 667684 is about 817.1193303306. The cubic root of 667684 is about 87.4024600159.

It can be divided in two parts, 66 and 7684, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 667684 in words is "six hundred sixty-seven thousand, six hundred eighty-four".