128636 has 6 divisors (see below), whose sum is σ = 225120. Its totient is φ = 64316.

The previous prime is 128629. The next prime is 128657. The reversal of 128636 is 636821.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16076 + ... + 16083.

It is an arithmetic number, because the mean of its divisors is an integer number (37520).

2¹²⁸⁶³⁶ is an apocalyptic number.

It is an amenable number.

128636 is a deficient number, since it is larger than the sum of its proper divisors (96484).

128636 is a wasteful number, since it uses less digits than its factorization.

128636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32163 (or 32161 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 128636 is about 358.6586120533. The cubic root of 128636 is about 50.4801738989.

The spelling of 128636 in words is "one hundred twenty-eight thousand, six hundred thirty-six".