128672858 has 8 divisors (see below), whose sum is σ = 193074420. Its totient is φ = 64314720.

The previous prime is 128672857. The next prime is 128672893. The reversal of 128672858 is 858276821.

It can be written as a sum of positive squares in 2 ways, for example, as 121506529 + 7166329 = 11023^2 + 2677^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128672857) 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, 2003 + ... + 16166.

Almost surely, 2^128672858 is an apocalyptic number.

128672858 is a deficient number, since it is larger than the sum of its proper divisors (64401562).

128672858 is a wasteful number, since it uses less digits than its factorization.

128672858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21712.

The product of its digits is 430080, while the sum is 47.

The square root of 128672858 is about 11343.4059259113. The cubic root of 128672858 is about 504.8499479034.

The spelling of 128672858 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, eight hundred fifty-eight".