128864627 has 4 divisors (see below), whose sum is σ = 128899656. Its totient is φ = 128829600.

The previous prime is 128864609. The next prime is 128864629. The reversal of 128864627 is 726468821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128864627 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (128864629) 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, 11249 + ... + 19602.

It is an arithmetic number, because the mean of its divisors is an integer number (32224914).

Almost surely, 2^128864627 is an apocalyptic number.

128864627 is a deficient number, since it is larger than the sum of its proper divisors (35029).

128864627 is an equidigital number, since it uses as much as digits as its factorization.

128864627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35028.

The product of its digits is 258048, while the sum is 44.

The square root of 128864627 is about 11351.8556632825. The cubic root of 128864627 is about 505.1006262897.

The spelling of 128864627 in words is "one hundred twenty-eight million, eight hundred sixty-four thousand, six hundred twenty-seven".