128682173 has 4 divisors (see below), whose sum is σ = 129335580. Its totient is φ = 128028768.

The previous prime is 128682133. The next prime is 128682221. The reversal of 128682173 is 371286821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371286821 = 3767 ⋅98563.

It can be written as a sum of positive squares in 2 ways, for example, as 125395204 + 3286969 = 11198^2 + 1813^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128682173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128682133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326408 + ... + 326801.

It is an arithmetic number, because the mean of its divisors is an integer number (32333895).

Almost surely, 2^128682173 is an apocalyptic number.

It is an amenable number.

128682173 is a deficient number, since it is larger than the sum of its proper divisors (653407).

128682173 is an equidigital number, since it uses as much as digits as its factorization.

128682173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653406.

The product of its digits is 32256, while the sum is 38.

The square root of 128682173 is about 11343.8165094469. The cubic root of 128682173 is about 504.8621301249.

The spelling of 128682173 in words is "one hundred twenty-eight million, six hundred eighty-two thousand, one hundred seventy-three".