128805707 has 4 divisors (see below), whose sum is σ = 128862936. Its totient is φ = 128748480.

The previous prime is 128805701. The next prime is 128805751. The reversal of 128805707 is 707508821.

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

It is a cyclic number.

It is not a de Polignac number, because 128805707 - 2¹⁸ = 128543563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128805701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25094 + ... + 29787.

It is an arithmetic number, because the mean of its divisors is an integer number (32215734).

Almost surely, 2^128805707 is an apocalyptic number.

128805707 is a deficient number, since it is larger than the sum of its proper divisors (57229).

128805707 is an equidigital number, since it uses as much as digits as its factorization.

128805707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57228.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 128805707 is about 11349.2601961538. The cubic root of 128805707 is about 505.0236331782.

The spelling of 128805707 in words is "one hundred twenty-eight million, eight hundred five thousand, seven hundred seven".