128456 has 8 divisors (see below), whose sum is σ = 240870. Its totient is φ = 64224.

The previous prime is 128449. The next prime is 128461. The reversal of 128456 is 654821.

It can be written as a sum of positive squares in only one way, i.e., 111556 + 16900 = 334^2 + 130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

128456 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, 8021 + ... + 8036.

2¹²⁸⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

128456 is a deficient number, since it is larger than the sum of its proper divisors (112414).

128456 is a wasteful number, since it uses less digits than its factorization.

128456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16063 (or 16059 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 128456 is about 358.4075892054. The cubic root of 128456 is about 50.4566173186.

The spelling of 128456 in words is "one hundred twenty-eight thousand, four hundred fifty-six".