634668 has 12 divisors (see below), whose sum is σ = 1480920. Its totient is φ = 211552.

The previous prime is 634651. The next prime is 634679. The reversal of 634668 is 866436.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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, 26433 + ... + 26456.

It is an arithmetic number, because the mean of its divisors is an integer number (123410).

2⁶³⁴⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

634668 is an abundant number, since it is smaller than the sum of its proper divisors (846252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634668 is a wasteful number, since it uses less digits than its factorization.

634668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52896 (or 52894 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 634668 is about 796.6605299624. The cubic root of 634668 is about 85.9373981046.

The spelling of 634668 in words is "six hundred thirty-four thousand, six hundred sixty-eight".