667636 has 6 divisors (see below), whose sum is σ = 1168370. Its totient is φ = 333816.

The previous prime is 667631. The next prime is 667643. The reversal of 667636 is 636766.

It can be written as a sum of positive squares in only one way, i.e., 571536 + 96100 = 756^2 + 310^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83451 + ... + 83458.

2⁶⁶⁷⁶³⁶ is an apocalyptic number.

It is an amenable number.

667636 is a deficient number, since it is larger than the sum of its proper divisors (500734).

667636 is a wasteful number, since it uses less digits than its factorization.

667636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166913 (or 166911 counting only the distinct ones).

The product of its digits is 27216, while the sum is 34.

The square root of 667636 is about 817.0899583277. The cubic root of 667636 is about 87.4003655028.

The spelling of 667636 in words is "six hundred sixty-seven thousand, six hundred thirty-six".