128735 has 4 divisors (see below), whose sum is σ = 154488. Its totient is φ = 102984.

The previous prime is 128717. The next prime is 128747. The reversal of 128735 is 537821.

128735 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 537821 = 47 ⋅11443.

It is a cyclic number.

It is not a de Polignac number, because 128735 - 2¹⁰ = 127711 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12869 + ... + 12878.

It is an arithmetic number, because the mean of its divisors is an integer number (38622).

2¹²⁸⁷³⁵ is an apocalyptic number.

128735 is a deficient number, since it is larger than the sum of its proper divisors (25753).

128735 is an equidigital number, since it uses as much as digits as its factorization.

128735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25752.

The product of its digits is 1680, while the sum is 26.

The square root of 128735 is about 358.7965997609. The cubic root of 128735 is about 50.4931206523.

The spelling of 128735 in words is "one hundred twenty-eight thousand, seven hundred thirty-five".