128756 has 6 divisors (see below), whose sum is σ = 225330. Its totient is φ = 64376.

The previous prime is 128749. The next prime is 128761. The reversal of 128756 is 657821.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 28900 = 316^2 + 170^2 .

It is a plaindrome in base 14.

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is a congruent number.

It is an unprimeable number.

128756 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16091 + ... + 16098.

It is an arithmetic number, because the mean of its divisors is an integer number (37555).

2¹²⁸⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

128756 is a deficient number, since it is larger than the sum of its proper divisors (96574).

128756 is a wasteful number, since it uses less digits than its factorization.

128756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32193 (or 32191 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 128756 is about 358.8258630589. The cubic root of 128756 is about 50.4958660799.

The spelling of 128756 in words is "one hundred twenty-eight thousand, seven hundred fifty-six".