634128 has 40 divisors (see below), whose sum is σ = 1788576. Its totient is φ = 192000.

The previous prime is 634103. The next prime is 634141. The reversal of 634128 is 821436.

It is a happy number.

634128 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is one of the 548 Lynch-Bell numbers.

It is a junction number, because it is equal to n+sod(n) for n = 634098 and 634107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73 + ... + 1128.

2⁶³⁴¹²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894288).

634128 is an abundant number, since it is smaller than the sum of its proper divisors (1154448).

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

634128 is a wasteful number, since it uses less digits than its factorization.

634128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1217 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 634128 is about 796.3215430968. The cubic root of 634128 is about 85.9130182385.

The spelling of 634128 in words is "six hundred thirty-four thousand, one hundred twenty-eight".