634678 has 16 divisors (see below), whose sum is σ = 1100304. Its totient is φ = 271360.

The previous prime is 634651. The next prime is 634679. The reversal of 634678 is 876436.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634679) by changing a digit.

634678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (68769).

2⁶³⁴⁶⁷⁸ is an apocalyptic number.

634678 is a deficient number, since it is larger than the sum of its proper divisors (465626).

634678 is a wasteful number, since it uses less digits than its factorization.

634678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727.

The product of its digits is 24192, while the sum is 34.

The square root of 634678 is about 796.6668061367. Note that the first 3 decimals coincide. The cubic root of 634678 is about 85.9378494531.

The spelling of 634678 in words is "six hundred thirty-four thousand, six hundred seventy-eight".