667564 has 12 divisors (see below), whose sum is σ = 1176784. Its totient is φ = 331344.

The previous prime is 667561. The next prime is 667577. The reversal of 667564 is 465766.

It is not an unprimeable number, because it can be changed into a prime (667561) 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 3 ways as a sum of consecutive naturals, for example, 97 + ... + 1159.

2⁶⁶⁷⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

667564 is a deficient number, since it is larger than the sum of its proper divisors (509220).

667564 is a wasteful number, since it uses less digits than its factorization.

667564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1222 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 667564 is about 817.0458983435. The cubic root of 667564 is about 87.3972235450.

The spelling of 667564 in words is "six hundred sixty-seven thousand, five hundred sixty-four".