128277705 has 16 divisors (see below), whose sum is σ = 210792384. Its totient is φ = 66565440.

The previous prime is 128277691. The next prime is 128277707. The reversal of 128277705 is 507772821.

It is not a de Polignac number, because 128277705 - 2⁵ = 128277673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128277707) 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, 115011 + ... + 116120.

It is an arithmetic number, because the mean of its divisors is an integer number (13174524).

Almost surely, 2^128277705 is an apocalyptic number.

128277705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128277705 is a deficient number, since it is larger than the sum of its proper divisors (82514679).

128277705 is a wasteful number, since it uses less digits than its factorization.

128277705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231176.

The product of its (nonzero) digits is 54880, while the sum is 39.

The square root of 128277705 is about 11325.9747924848. The cubic root of 128277705 is about 504.3326216718.

It can be divided in two parts, 1282 and 77705, that added together give a palindrome (78987).

The spelling of 128277705 in words is "one hundred twenty-eight million, two hundred seventy-seven thousand, seven hundred five".