667634 has 8 divisors (see below), whose sum is σ = 1092528. Its totient is φ = 303460.

The previous prime is 667631. The next prime is 667643. The reversal of 667634 is 436766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 667634.

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 in 3 ways as a sum of consecutive naturals, for example, 15152 + ... + 15195.

It is an arithmetic number, because the mean of its divisors is an integer number (136566).

2⁶⁶⁷⁶³⁴ is an apocalyptic number.

667634 is a deficient number, since it is larger than the sum of its proper divisors (424894).

667634 is a wasteful number, since it uses less digits than its factorization.

667634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30360.

The product of its digits is 18144, while the sum is 32.

The square root of 667634 is about 817.0887344714. The cubic root of 667634 is about 87.4002782293.

The spelling of 667634 in words is "six hundred sixty-seven thousand, six hundred thirty-four".