128496671 has 4 divisors (see below), whose sum is σ = 131969592. Its totient is φ = 125023752.

The previous prime is 128496619. The next prime is 128496673. The reversal of 128496671 is 176694821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128496671 is a prime.

It is a super-2 number, since 2×128496671² = 33022788916164482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128496673) 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, 1736405 + ... + 1736478.

It is an arithmetic number, because the mean of its divisors is an integer number (32992398).

Almost surely, 2^128496671 is an apocalyptic number.

128496671 is a deficient number, since it is larger than the sum of its proper divisors (3472921).

128496671 is an equidigital number, since it uses as much as digits as its factorization.

128496671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472920.

The product of its digits is 145152, while the sum is 44.

The square root of 128496671 is about 11335.6372119083. The cubic root of 128496671 is about 504.6194185133.

The spelling of 128496671 in words is "one hundred twenty-eight million, four hundred ninety-six thousand, six hundred seventy-one".