128668027 has 4 divisors (see below), whose sum is σ = 129314800. Its totient is φ = 128021256.

The previous prime is 128668009. The next prime is 128668031. The reversal of 128668027 is 720866821.

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

It is a cyclic number.

It is not a de Polignac number, because 128668027 - 2⁷ = 128667899 is a prime.

It is a super-2 number, since 2×128668027² = 33110922344145458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128668927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323088 + ... + 323485.

It is an arithmetic number, because the mean of its divisors is an integer number (32328700).

Almost surely, 2^128668027 is an apocalyptic number.

128668027 is a deficient number, since it is larger than the sum of its proper divisors (646773).

128668027 is an equidigital number, since it uses as much as digits as its factorization.

128668027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646772.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 128668027 is about 11343.1929808145. The cubic root of 128668027 is about 504.8436296566.

The spelling of 128668027 in words is "one hundred twenty-eight million, six hundred sixty-eight thousand, twenty-seven".