128634 has 16 divisors (see below), whose sum is σ = 280800. Its totient is φ = 38960.

The previous prime is 128629. The next prime is 128657. The reversal of 128634 is 436821.

It is a happy number.

It is a nialpdrome in base 11.

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, 909 + ... + 1040.

It is an arithmetic number, because the mean of its divisors is an integer number (17550).

2¹²⁸⁶³⁴ is an apocalyptic number.

128634 is an abundant number, since it is smaller than the sum of its proper divisors (152166).

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

128634 is a wasteful number, since it uses less digits than its factorization.

128634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965.

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

The square root of 128634 is about 358.6558238758. The cubic root of 128634 is about 50.4799122799.

It can be divided in two parts, 12 and 8634, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 128634 in words is "one hundred twenty-eight thousand, six hundred thirty-four".