128617234 has 4 divisors (see below), whose sum is σ = 192925854. Its totient is φ = 64308616.

The previous prime is 128617231. The next prime is 128617243. The reversal of 128617234 is 432716821.

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., 70140625 + 58476609 = 8375^2 + 7647^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128617234.

It is not an unprimeable number, because it can be changed into a prime (128617231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32154307 + ... + 32154310.

Almost surely, 2^128617234 is an apocalyptic number.

128617234 is a deficient number, since it is larger than the sum of its proper divisors (64308620).

128617234 is an equidigital number, since it uses as much as digits as its factorization.

128617234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64308619.

The product of its digits is 16128, while the sum is 34.

The square root of 128617234 is about 11340.9538399554. The cubic root of 128617234 is about 504.7771902102. Note that the first 3 decimals are identical.

The spelling of 128617234 in words is "one hundred twenty-eight million, six hundred seventeen thousand, two hundred thirty-four".