128635 has 8 divisors (see below), whose sum is σ = 166320. Its totient is φ = 94944.

The previous prime is 128629. The next prime is 128657. The reversal of 128635 is 536821.

It is a happy number.

128635 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128635 - 2⁵ = 128603 is a prime.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925 + ... + 1054.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2¹²⁸⁶³⁵ is an apocalyptic number.

128635 is a deficient number, since it is larger than the sum of its proper divisors (37685).

128635 is a wasteful number, since it uses less digits than its factorization.

128635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997.

The product of its digits is 1440, while the sum is 25.

The square root of 128635 is about 358.6572179672. The cubic root of 128635 is about 50.4800430897.

The spelling of 128635 in words is "one hundred twenty-eight thousand, six hundred thirty-five".