128663 has 2 divisors, whose sum is σ = 128664. Its totient is φ = 128662.

The previous prime is 128659. The next prime is 128669. The reversal of 128663 is 366821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128663 - 2² = 128659 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64331 + 64332.

It is an arithmetic number, because the mean of its divisors is an integer number (64332).

2¹²⁸⁶⁶³ is an apocalyptic number.

128663 is a deficient number, since it is larger than the sum of its proper divisors (1).

128663 is an equidigital number, since it uses as much as digits as its factorization.

128663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 128663 is about 358.6962503289. The cubic root of 128663 is about 50.4837054902.

It can be divided in two parts, 1286 and 63, that multiplied together give a palindrome (81018).

The spelling of 128663 in words is "one hundred twenty-eight thousand, six hundred sixty-three".