128715799 has 4 divisors (see below), whose sum is σ = 130042864. Its totient is φ = 127388736.

The previous prime is 128715791. The next prime is 128715803. The reversal of 128715799 is 997517821.

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 128715799 - 2³ = 128715791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128715791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663387 + ... + 663580.

It is an arithmetic number, because the mean of its divisors is an integer number (32510716).

Almost surely, 2^128715799 is an apocalyptic number.

128715799 is a deficient number, since it is larger than the sum of its proper divisors (1327065).

128715799 is an equidigital number, since it uses as much as digits as its factorization.

128715799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327064.

The product of its digits is 317520, while the sum is 49.

The square root of 128715799 is about 11345.2985416868. The cubic root of 128715799 is about 504.9061015498.

The spelling of 128715799 in words is "one hundred twenty-eight million, seven hundred fifteen thousand, seven hundred ninety-nine".