128173671 has 10 divisors (see below), whose sum is σ = 191469432. Its totient is φ = 85449060.

The previous prime is 128173657. The next prime is 128173697. The reversal of 128173671 is 176371821.

It is not a de Polignac number, because 128173671 - 2⁷ = 128173543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128173621) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 791115 + ... + 791276.

Almost surely, 2^128173671 is an apocalyptic number.

128173671 is a deficient number, since it is larger than the sum of its proper divisors (63295761).

128173671 is an equidigital number, since it uses as much as digits as its factorization.

128173671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582403 (or 1582394 counting only the distinct ones).

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

The square root of 128173671 is about 11321.3811436591. The cubic root of 128173671 is about 504.1962458554.

The spelling of 128173671 in words is "one hundred twenty-eight million, one hundred seventy-three thousand, six hundred seventy-one".