128677138 has 4 divisors (see below), whose sum is σ = 193015710. Its totient is φ = 64338568.

The previous prime is 128677127. The next prime is 128677169. The reversal of 128677138 is 831776821.

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

It can be written as a sum of positive squares in only one way, i.e., 122036209 + 6640929 = 11047^2 + 2577^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128677094 and 128677103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32169283 + ... + 32169286.

Almost surely, 2^128677138 is an apocalyptic number.

128677138 is a deficient number, since it is larger than the sum of its proper divisors (64338572).

128677138 is an equidigital number, since it uses as much as digits as its factorization.

128677138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64338571.

The product of its digits is 112896, while the sum is 43.

The square root of 128677138 is about 11343.5945802025. The cubic root of 128677138 is about 504.8555453901.

The spelling of 128677138 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, one hundred thirty-eight".