128806 has 4 divisors (see below), whose sum is σ = 193212. Its totient is φ = 64402.

The previous prime is 128767. The next prime is 128813. The reversal of 128806 is 608821.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200 + ... + 32203.

It is an arithmetic number, because the mean of its divisors is an integer number (48303).

2¹²⁸⁸⁰⁶ is an apocalyptic number.

128806 is a deficient number, since it is larger than the sum of its proper divisors (64406).

128806 is an equidigital number, since it uses as much as digits as its factorization.

128806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64405.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 128806 is about 358.8955279744. The cubic root of 128806 is about 50.5024016111.

The spelling of 128806 in words is "one hundred twenty-eight thousand, eight hundred six".