128673 has 18 divisors (see below), whose sum is σ = 203814. Its totient is φ = 77952.

The previous prime is 128669. The next prime is 128677. The reversal of 128673 is 376821.

It is an interprime number because it is at equal distance from previous prime (128669) and next prime (128677).

It can be written as a sum of positive squares in 3 ways, for example, as 36864 + 91809 = 192^2 + 303^2 .

It is not a de Polignac number, because 128673 - 2² = 128669 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128677) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4423 + ... + 4451.

It is an arithmetic number, because the mean of its divisors is an integer number (11323).

128673 is a Friedman number, since it can be written as 87^2*(6*3-1), using all its digits and the basic arithmetic operations.

2¹²⁸⁶⁷³ is an apocalyptic number.

It is an amenable number.

128673 is a deficient number, since it is larger than the sum of its proper divisors (75141).

128673 is a wasteful number, since it uses less digits than its factorization.

128673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 49 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 128673 is about 358.7101894287. The cubic root of 128673 is about 50.4850133616.

The spelling of 128673 in words is "one hundred twenty-eight thousand, six hundred seventy-three".