128872673 has 8 divisors (see below), whose sum is σ = 134324736. Its totient is φ = 123501600.

The previous prime is 128872663. The next prime is 128872721. The reversal of 128872673 is 376278821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128872673 - 2¹² = 128868577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128872603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16988 + ... + 23373.

It is an arithmetic number, because the mean of its divisors is an integer number (16790592).

Almost surely, 2^128872673 is an apocalyptic number.

It is an amenable number.

128872673 is a deficient number, since it is larger than the sum of its proper divisors (5452063).

128872673 is a wasteful number, since it uses less digits than its factorization.

128872673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40495.

The product of its digits is 225792, while the sum is 44.

The square root of 128872673 is about 11352.2100491490. The cubic root of 128872673 is about 505.1111384971. Note that the first 4 decimals are identical.

The spelling of 128872673 in words is "one hundred twenty-eight million, eight hundred seventy-two thousand, six hundred seventy-three".