128738673 has 32 divisors (see below), whose sum is σ = 218501120. Its totient is φ = 73386000.

The previous prime is 128738669. The next prime is 128738683. The reversal of 128738673 is 376837821.

It is not a de Polignac number, because 128738673 - 2² = 128738669 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128738663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141486 + ... + 142392.

It is an arithmetic number, because the mean of its divisors is an integer number (6828160).

Almost surely, 2^128738673 is an apocalyptic number.

It is an amenable number.

128738673 is a deficient number, since it is larger than the sum of its proper divisors (89762447).

128738673 is an equidigital number, since it uses as much as digits as its factorization.

128738673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674 (or 1668 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 128738673 is about 11346.3065796760. The cubic root of 128738673 is about 504.9360086220.

The spelling of 128738673 in words is "one hundred twenty-eight million, seven hundred thirty-eight thousand, six hundred seventy-three".