128800905 has 16 divisors (see below), whose sum is σ = 216928320. Its totient is φ = 65078208.

The previous prime is 128800883. The next prime is 128800909. The reversal of 128800905 is 509008821.

It is a happy number.

It is not a de Polignac number, because 128800905 - 2⁵ = 128800873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128800909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225682 + ... + 226251.

It is an arithmetic number, because the mean of its divisors is an integer number (13558020).

Almost surely, 2^128800905 is an apocalyptic number.

128800905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128800905 is a deficient number, since it is larger than the sum of its proper divisors (88127415).

128800905 is a wasteful number, since it uses less digits than its factorization.

128800905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451960.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 128800905 is about 11349.0486385424. The cubic root of 128800905 is about 505.0173571788.

The spelling of 128800905 in words is "one hundred twenty-eight million, eight hundred thousand, nine hundred five".