128006305 has 16 divisors (see below), whose sum is σ = 179835264. Its totient is φ = 85633920.

The previous prime is 128006299. The next prime is 128006327. The reversal of 128006305 is 503600821.

It is a happy number.

It is not a de Polignac number, because 128006305 - 2²³ = 119617697 is a prime.

It is a super-2 number, since 2×128006305² = 32771228239506050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128006305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43167 + ... + 46036.

It is an arithmetic number, because the mean of its divisors is an integer number (11239704).

Almost surely, 2^128006305 is an apocalyptic number.

It is an amenable number.

128006305 is a deficient number, since it is larger than the sum of its proper divisors (51828959).

128006305 is an equidigital number, since it uses as much as digits as its factorization.

128006305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89256.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 128006305 is about 11313.9871398195. The cubic root of 128006305 is about 503.9766946161.

The spelling of 128006305 in words is "one hundred twenty-eight million, six thousand, three hundred five".