128711673 has 20 divisors (see below), whose sum is σ = 194189028. Its totient is φ = 84952800.

The previous prime is 128711663. The next prime is 128711699. The reversal of 128711673 is 376117821.

It can be written as a sum of positive squares in 2 ways, for example, as 72641529 + 56070144 = 8523^2 + 7488^2 .

It is not a de Polignac number, because 128711673 - 2⁸ = 128711417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128711603) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 315 + ... + 16047.

Almost surely, 2^128711673 is an apocalyptic number.

It is an amenable number.

128711673 is a deficient number, since it is larger than the sum of its proper divisors (65477355).

128711673 is a wasteful number, since it uses less digits than its factorization.

128711673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15846 (or 15837 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 128711673 is about 11345.1167027933. The cubic root of 128711673 is about 504.9007065507.

The spelling of 128711673 in words is "one hundred twenty-eight million, seven hundred eleven thousand, six hundred seventy-three".