128771715 has 16 divisors (see below), whose sum is σ = 209923488. Its totient is φ = 67382016.

The previous prime is 128771711. The next prime is 128771767. The reversal of 128771715 is 517177821.

128771715 = 263² + 264² + ... + 739².

It is not a de Polignac number, because 128771715 - 2² = 128771711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128771711) 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, 80194 + ... + 81783.

It is an arithmetic number, because the mean of its divisors is an integer number (13120218).

Almost surely, 2^128771715 is an apocalyptic number.

128771715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128771715 is a deficient number, since it is larger than the sum of its proper divisors (81151773).

128771715 is a wasteful number, since it uses less digits than its factorization.

128771715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162038.

The product of its digits is 27440, while the sum is 39.

The square root of 128771715 is about 11347.7625547947. The cubic root of 128771715 is about 504.9792037968.

The spelling of 128771715 in words is "one hundred twenty-eight million, seven hundred seventy-one thousand, seven hundred fifteen".