128766 has 16 divisors (see below), whose sum is σ = 281088. Its totient is φ = 39000.

The previous prime is 128761. The next prime is 128767. The reversal of 128766 is 667821.

It is a happy number.

128766 is nontrivially palindromic in base 12.

128766 is an undulating number in base 12.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910 + ... + 1041.

It is an arithmetic number, because the mean of its divisors is an integer number (17568).

2¹²⁸⁷⁶⁶ is an apocalyptic number.

128766 is an abundant number, since it is smaller than the sum of its proper divisors (152322).

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

128766 is a wasteful number, since it uses less digits than its factorization.

128766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967.

The product of its digits is 4032, while the sum is 30.

The square root of 128766 is about 358.8397971240. The cubic root of 128766 is about 50.4971733215.

It can be divided in two parts, 12 and 8766, that added together give a palindrome (8778).

The spelling of 128766 in words is "one hundred twenty-eight thousand, seven hundred sixty-six".